Dissertations / Theses on the topic 'Drilling performance'
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1
Xia, Tian. "INVESTIGATION OF DRILLING PERFORMANCE IN CRYOGENIC DRILLING ON CFRP COMPOSITE LAMINATES." UKnowledge, 2014. http://uknowledge.uky.edu/me_etds/36.
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In recent years, there has been a substantial growth in the application of carbon fiber reinforced plastic (CFRP) composite materials in automobile and aerospace industries due to their superior properties such as lightweight, high strength, excellent corrosion resistance, and minimal fatigue concerns. The present study evaluates the drilling performance of woven carbon fiber reinforced plastics under both dry and cryogenic cooling conditions using uncoated solid carbide drill with a through-hole for coolant application.
The effects of the cooling conditions and the cutting parameters on drilling performance in drilling CFRP were evaluated in terms of generated thrust force, torque, cutting edge radius, outer corner flank wear, hole quality (including surface roughness, diameter error, roundness, delamination, burr formation, sub-surface quality). Both cooling conditions and cutting parameters were found to influence the thrust force and torque at different levels. The thrust force and the torque are higher in cryogenic cooling under all cutting parameters. In most of the cases, cryogenic drilling gives better bore-hole quality with lower surface roughness, more accurate diameter, less burr generation, better sub-surface quality, etc. Also, the tool-wear rates measured in drilling shows that cryogenic drilling produces less tool-wear than dry drilling does.
2
Rowsell, Philip J. "The automatic optimisation of drilling performance." Thesis, University of Nottingham, 1991. http://eprints.nottingham.ac.uk/11909/.
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The drilling industry, along with many others, is becoming increasingly competitive, demanding greater efforts to improve safety and reduce costs. For this reason, companies are progressively looking towards computerised automation to enhance performance. Unlike most industries however, the drilling industry has been slow to take advantage of the advances in computer and automation technology. Only recently have automatic operations such as tubular handling been placed under computer control. These activities relate to peripheral mechanical handling problems which are relatively easy to solve. The concept of an automatic intelligent drill, capable of making its own or assisted decisions about drilling parameters such as weight on bit or rotational speed, may seem remote and far into the future. Research in drilling automation, at the University of Nottingham, has the ultimate objective of achieving computerized drill control through the the application of an intelligent knowledge induction system. At the University, a laboratory rig has been developed with such a system installed. Decisions for optimal performance are based on either maximum penetration or minimum cost drilling. The system has a self-learning capability, allowing a progressive improvement in performance. The prototype system is currently undergoing trials, using real data collected while the laboratory rig is drilling and artificial data. The results are very encouraging and demonstrate the feasibility and advantages of optimised drill performance. This thesis describes the design and development of this drill optimisation scheme produced by the author. Both the theory behind the optimisation system, and the results of the initial phase of Laboratory testing are included.
3
Åkerlund, Elin, Rebecka Havo, Åberg Jakob Jonsson, Patrik Österberg, and Mikael Fredriksson. "High Performance Steel for Percussive Drilling." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-323387.
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Atlas Copco Secoroc AB are searching after new bulk materials for drill heads that are used in percussive drilling in order to improve their strength and durability. The aim of this project is to assist Atlas Copco in this search and provide them with further information regarding material properties, alloying elements, suppliers, etc. A literary study was carried out in order to identify materials that had UTS and KIC more than or equal to 1700 MPa and 70 MPa*m1/2, respectively. Materials that fulfilled these criteria were T250 grade maraging steel, Cobalt free maraging steel, High cobalt maraging steel, 300 grade maraging steel, AerMet 100, AF1410, S53, M54, 300M, 4340M and PremoMet. These were categorized into maraging steels, high alloy secondary hardened steels, and low alloy steels, and were then further researched. The material with the highest combination of UTS and KIC was M54 followed by AerMet 100; while AF1410 had the highest KIC but a low UTS, and PremoMet had the highest UTS but a low KIC. Maraging steels and HASH steels have a similar price range, while low alloy steels are much cheaper.
4
Åkerlund, Elin, Åberg Jakob Jonsson, Patrik Österberg, Rebecka Havo, and Mikael Fredriksson. "High Performance Steel for Percussive Drilling." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-323808.
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Atlas Copco Secoroc AB are searching after new bulk materials for drill heads that are used in percussive drilling in order to improve their strength and durability. The aim of this project is to assist Atlas Copco in this search and provide them with further information regarding material properties, alloying elements, suppliers, etc. A literary study was carried out in order to identify materials that had UTS and KIC more than or equal to 1700 MPa and 70 MPa*m^1/2, respectively. Materials that fulfilled these criteria were T250 grade maraging steel, Cobalt free maraging steel, High cobalt maraging steel, 300 grade maraging steel, AerMet 100, AF1410, S53, M54, 300M, 4340M and PremoMet. These were categorized into maraging steels, high alloy secondary hardened steels, and low alloy steels, and were then further researched. The material with the highest combination of UTS and KIC was M54 followed by AerMet 100; while AF1410 had the highest KIC but a low UTS, and PremoMet had the highest UTS but a low KIC. Maraging steels and HASH steels have a similar price range, while low alloy steels are much cheaper.
5
Sonmez, Ahmet. "Performance Analysis Of Drilling Fluid Liquid Lubricants." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613581/index.pdf.
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Excessive torque is one of the most important problems in oil/gas drilling industry. Friction between wellbore/casing and drill string causes excessive torque. This study discusses performance analysis of drilling fluid lubricants, which are used as friction reducers in well-bore. Three different types of commercial chemical lubricants, which are fatty acid and glycerid based, triglycerid and vegetable oil based and polypropylene glycol based, diesel oil, and crude oil, which consists of different API gravity, paraffin and asphaltene value samples, were selected for the analysis.
In the analysis, different lubricant compositions with the mixture of commercial chemical lubricants, crude oil and diesel oil, which were added to water based lignosulfonate mud, are tested on metal-metal contact surface by Ofite Lubricity Tester to determine the best lubricity/cost ratio of lubricant compositions.
Moreover, effects of the lubricants on mud rheology and API fluid loss of mud, foam forming potential and cheesing/greasing of the lubricants and the influence of mud properties on lubricants (calcium, salt, pH and mud density) are examined.
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Ozkan, Erdal. "Performance of horizontal wells /." Access abstract and link to full text, 1988. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/8825498.
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Farrelly, M. "Performance evaluation and selection of rotary drilling bits." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234404.
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Ambrose, D. "Diamond core bit performance analysis." Thesis, University of Nottingham, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378761.
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Späth, Bastian, Matthias Philipp, and Thomas Bartnitzki. "Machine performance and acoustic fingerprints of cutting and drilling." Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2018. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-231193.
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‘It is always dark ahead of the pick!’ This centuries-old miners’ expression still reveals the uncertainty about the upcoming rock properties during exploration and extraction processes. It is still tough to predict what a drill rig or a cutting machine will experience during operation. However, in terms of safety, energy consumption and the performance of the whole machine it would be beneficial to be able to monitor such an extraction process. Hence, different sensors or sensor combinations are tested during cutting and drilling processes within RealTime Mining project. First aim is to depict the machine performance of the machine at any time. In a second step sensor information is also used to conclude on mechanical rock properties during the process.
Measuring the machine performance for cutting and drilling is quite similar and has been condensed under the terms Monitoring-While-Cutting (MWC) respectively Monitoring-While-Drilling (MWD). Both monitoring systems contain a bundle of sensors to depict the whole process. As an example, the energy demand of such a machine can be determined by measuring the power consumption of the engines constantly. Furthermore, the process parameters like advance rates and drilling or cutting speed have to be evaluated as well to be able to depict the whole extraction machine.
To conclude on mechanical rock properties several other sensor solutions have been tested and finally integrated into those monitoring systems. One of the most important rock properties for drilling and cutting is the rock strength. Increasing rock strength during an extraction process leads to increasing forces that are needed to break a certain amount of rock. Hence, e.g. measuring the torque of a drill string or the cutting forces can be an indicator on rock resistance or rock strength. Not minor important, is the characteristic rock breakage behavior which can be classified by the use of ‘acoustic’ sensors. Dependent on the rock properties that currently is drilled or cut through a characteristic fracture occurs in front of the tool. This results in audible and also inaudible characteristic acoustic waves that propagate through the machine body and can be gathered on the machine by piezo-electric sensors. The interpretation of these signals could lead to a material classification already during the extraction process.
Several tests of these sensor technologies have been conducted in laboratory environment as well in field tests. The most promising results are going to be presented.
10
Späth, Bastian, Matthias Philipp, and Thomas Bartnitzki. "Machine performance and acoustic fingerprints of cutting and drilling." TU Bergakademie Freiberg, 2017. https://tubaf.qucosa.de/id/qucosa%3A23182.
Full textAbstract:
‘It is always dark ahead of the pick!’ This centuries-old miners’ expression still reveals the uncertainty about the upcoming rock properties during exploration and extraction processes. It is still tough to predict what a drill rig or a cutting machine will experience during operation. However, in terms of safety, energy consumption and the performance of the whole machine it would be beneficial to be able to monitor such an extraction process. Hence, different sensors or sensor combinations are tested during cutting and drilling processes within RealTime Mining project. First aim is to depict the machine performance of the machine at any time. In a second step sensor information is also used to conclude on mechanical rock properties during the process.
Measuring the machine performance for cutting and drilling is quite similar and has been condensed under the terms Monitoring-While-Cutting (MWC) respectively Monitoring-While-Drilling (MWD). Both monitoring systems contain a bundle of sensors to depict the whole process. As an example, the energy demand of such a machine can be determined by measuring the power consumption of the engines constantly. Furthermore, the process parameters like advance rates and drilling or cutting speed have to be evaluated as well to be able to depict the whole extraction machine.
To conclude on mechanical rock properties several other sensor solutions have been tested and finally integrated into those monitoring systems. One of the most important rock properties for drilling and cutting is the rock strength. Increasing rock strength during an extraction process leads to increasing forces that are needed to break a certain amount of rock. Hence, e.g. measuring the torque of a drill string or the cutting forces can be an indicator on rock resistance or rock strength. Not minor important, is the characteristic rock breakage behavior which can be classified by the use of ‘acoustic’ sensors. Dependent on the rock properties that currently is drilled or cut through a characteristic fracture occurs in front of the tool. This results in audible and also inaudible characteristic acoustic waves that propagate through the machine body and can be gathered on the machine by piezo-electric sensors. The interpretation of these signals could lead to a material classification already during the extraction process.
Several tests of these sensor technologies have been conducted in laboratory environment as well in field tests. The most promising results are going to be presented.
11
Cong, Weilong. "Drilling of high-performance materials: experimental, numerical, and theoretical investigations." Diss., Kansas State University, 2013. http://hdl.handle.net/2097/15476.
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Doctor of PhilosophyDepartment of Industrial & Manufacturing Systems Engineering
Zhijian Pei
High-performance materials, such as silicon, aerospace stainless steels, titanium alloys, and carbon fiber reinforced plastic (CFRP) composites, have a variety of engineering applications. However, they usually have poor machinability and are classified as hard-to-machine materials. Drilling is one of the important machining processes for these materials. Industries are always under tremendous pressure to meet the ever-increasing demand for lower cost and better quality of the products made from these high-performance materials. Rotary ultrasonic machining (RUM) is a non-traditional machining process that combines the material removal mechanisms of diamond grinding and ultrasonic machining. It is a relatively low-cost, environment-benign process that easily fits in the infrastructure of the traditional machining environment. Other advantages of this process include high hole accuracy, superior surface finish, high material removal rate, low tool pressure, and low tool wear rate. The goal of this research is to provide new knowledge of machining these high performance materials with RUM for further improvement in the machined hole quality and decrease in the machining cost. A thorough research in this dissertation has been conducted by experimental, numerical, and theoretical investigations on output variables, including cutting force, torque, surface roughness, tool wear, cutting temperature, material removal rate, edge chipping (for silicon), power consumption (for CFRP), delamination (for CFRP), and feasible regions (for dry machining of CFRP). In this dissertation, an introduction of workpiece materials and RUM are discussed first. After that, two literature reviews on silicon drilling and dry drilling are presented. Then, design of experiment and finite element analysis on edge chipping in RUM of silicon, experimental investigations and finite element analysis on RUM of aerospace stainless steels, an ultrasonic vibration amplitude measurement method and a cutting temperature measurement method for RUM using titanium alloys as workpiece, experimental and theoretical investigations on RUM of CFRP composites, and experimental studies on CFRP/Ti stacks are presented, respectively. Finally, conclusions and contributions on RUM drilling are discussed.
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Al-Basman, Al-Rashidi Abdulrahman. "Application of neural networks to evaluate factors affecting drilling performance." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/6914.
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Achieving the highest Rate of Penetration (ROP) with the least possible Bit Tooth Wear Rate (BTWR) is the aim of every drilling engineer when selecting a drilling bit. Predicting the optimal ROP has become increasingly important given the rise in expenses involved in drilling a well. This has meant that oil companies engage in a perpetual struggle to predict the optimum rock mechanical property parameters. Predicting optimal rock mechanical property parameters, specifically Rate of Penetration (ROP), has become increasingly important given the rise in expenses involved in drilling a well. The prediction of ROP from the current available data is an important criterion for reduction of drilling costs. ROP represents rock bit interaction which relates rock compressive strength and bit aggressivity. ROP prediction is complex because of the numerous variables which lead to difficulties in evaluating drilling parameters. Several models and methods have been published for predicting, and therefore potentially optimizing rate of penetration. However, these models and methods have limitations, too many variables are included, their input parameters are often not readily available, and their relationships are complex and not easily modeled. Therefore, the application of Neural Network is suggested in this study. A new methodology has been developed to predict the rate of penetration using the Artificial Neural Network (ANN). Three case studies representing different formations in Kuwait have been conducted to investigate ROP prediction for various applications. These cases have investigated the prediction of ROP for a specific heterogeneous formation (CASE I); a semihomogenous formation (CASE II); a drilling section composed of a heterogeneous formation and for a drilling section composed of a complex heterogeneous set of formations (CASE III). Predicting ROP parameters is of particular interest, therefore finding a new method to predict ROP for the cases investigated in this study will be a valuable achievement. Application of the new network models would then be used for selecting the best parameters for an optimal drilling strategy based on field data. In addition to the prediction of ROP, several runs were carried out to predict Tooth Wear Rate (TWR) for a drilling section in case III. Rock bit interactions in the field as a function of rock mechanical property parameters was achieved by predicting ROP which relates to rock compressive strength and bit aggressivity; as well as TWR which relates to rock abrasiveness and wear resistance. History of bit runs, mud logging data, geological information, offset well bit records, drill bit characteristics, and wireline data all play an important role in the prediction of rock bit interactions in this study. Based on field data, the prediction of rock mechanical property parameters can be accomplished by the use of a neural network as an alternative prediction and optimization method. Neural network offers a new form of information processing that is fundamentally different from a traditional processing system. The system uses a knowledge base of various drilling parameters, to produce a “correlation” description of the optimal Rate of Penetration.
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Tripuraneni, Gopi Chand. "Performance Analysis of Enhanced Activated Sludge as Drilling Mud Additive." Thesis, University of Louisiana at Lafayette, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10268960.
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The use of drilling fluids alone is not sufficient to reduce friction substantially, so a suitable lubricant has to be added to the drilling fluid so as to reduce the friction to an acceptable range. The lubricant reduces friction of fluid by producing a thin film of liquid that separates the solid surfaces in contact.
The primary objective of this research is to evaluate the performance of enhanced activated sludge (EAS) as a lubricant in drilling fluids. Enhanced activated sludge is composed of mixed consortium of microorganisms grown under conditions that promote lipid accumulation. Experiments were conducted to evaluate (EAS) with different lipid contents. Performance of EAS as drilling fluid additive was compared with commercial lubricants in terms of lubricity and flow properties. Lubricants are evaluated using water-based drilling mud at lubricant concentrations of 1.78, 3.11, 4.43, and 6.17 pounds per barrel (ppb). Experiments were carried out in a standard lubricity meter. The Lubricity meter tests the ability of the lubricant in the drilling mud to reduce friction. Other parameters measured re plastic viscosity, gel strength, fluid loss, mud cake thickness, sand content, methylene blue test (MBT), alkalinity, and chlorides.
All the lubricants studied (including EAS) lowered the coefficient of friction and significant torque reduction. EAS reduced the torque and fluid loss better than raw sludge. However, the top performers in terms of reducing the torque were the commercial lubricants. Bio Add was the best performer in the presence of both barite and bentonite. HDL+ resulted in the least coefficient of friction when the mud was prepared with only bentonite. A cost analysis was prepared to show the economics involved in using sludge (raw and EAS) as additive in drilling fluids. These findings show the potential of activated sludge for improving the properties of water-based drilling mud.
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Ersoy, A. "Performance analysis of polycrystalline diamond compact (PDC) core bits in rocks." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309552.
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Wendling, Ignatz. "An evaluation of the performance of disc coulters." Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287830.
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Manthri, Sandeep. "EXPERIMENTAL INVESTIGATION OF PCD COMPACT CORE DRILL PERFORMANCE ON BASALT SIMULATING SUSTAINABLE DRY DRILLING ON MARS." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/495.
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Missions to Mars aim to characterize rock and subsurface soil samples and possibly bring some back to Earth for more thorough and sophisticated examination. The Martian surface is covered with basalt which has high compressive strength (andamp;gt;130 MPa), and is more difficult to drill than the much softer sedimentary formations that are presently being drilled using diamond core drills. The main objective of this thesis work is to provide the requisite groundwork towards the development of improved and sustainable drills for subsurface drilling applications on Mars, when their goals are obtaining samples. Since progressive drill-wear is substantial in sustained drilling, the experiments were designed and conducted to study the tool-wear mechanisms and understand the associated effects on drilling performance in subsurface drilling of basalt. Core drilling experiments are conducted with different drill geometries and cutting conditions in a Martian simulant, basaltic rock; monitoring thrust force, torque and measuring tool-wear for a series of successive depth-increments. Based on the experimental results an optimization model has been developed for maximizing drilling depth with minimum tool-wear. This preliminary work will help the development of smart and sustainable drills for dry drilling applications for future NASA missions to Mars.
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Montgomery, Justin B. (Justin Bruce). "Characterizing shale gas and tight oil drilling and production performance variability." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98600.
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Thesis: S.M. in Technology and Policy, Massachusetts Institute of Technology, Engineering Systems Division, Technology and Policy Program, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 137-147).
Shale gas and tight oil are energy resources of growing importance to the U.S. and the world. The combination of horizontal drilling and hydraulic fracturing has enabled economically feasible production from these resources, leading to a surge in domestic oil and gas production. This is providing an economic boon and reducing reliance on foreign sources of energy in the U.S., but there are still a number of environmental, economic, and technical challenges that must be overcome to unlock the resource's full potential. One key challenge is understanding variability in individual well performance-in terms of both drilling time (a key driver of well cost) and well productivity-which has led to greater than anticipated economic risk associated with shale gas and tight oil development. Thus far, more reliable forecasting has remained elusive due to its prohibitive cost and the poorly understood nature of the resource. There is an opportunity to make use of available drilling and production data to improve the characterization of variability. For my analysis, I use publicly-available well production data and drilling reports from a development campaign. In order to characterize variability, I use a combination of graphical, statistical, and data analytics methods. For well productivity, I use probability plots to demonstrate a universality to the distribution shape, which can accurately be described as lognormal. Building on this distributional assumption, I demonstrate the utility of Bayesian statistical inference for improving estimates of the distribution parameters, which will allow companies to better anticipate resource variability and make better decisions under this uncertainty. For drilling, I characterize variability in operations by using approximate string matching to compare drilling activity sequences, leading to a metric for operational variability. Activity sequences become more similar over time, consistent with the notion of standardization. Finally, I investigate variability of drilling times as they progress along the learning curve, using probability plots again. I find some indication of lognormality, with implications for how learning in drilling should be measured and predicted. This thesis emphasizes the relevance of data analytics to characterizing performance variability across the spectrum in shale gas and tight oil. The findings also demonstrate the value of such an approach for identifying patterns of behavior, estimating future variability, and guiding development strategies.
by Justin B. Montgomery.
S.M. in Technology and Policy
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El-Wahab, Abo B. I. A. "The influence of tool geometry on the performance of drilling tools." Thesis, Aston University, 1985. http://publications.aston.ac.uk/11869/.
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The main objective of the work presented in this thesis is to investigate the two sides of the flute, the face and the heel of a twist drill. The flute face was designed to yield straight diametral lips which could be extended to eliminate the chisel edge, and consequently a single cutting edge will be obtained. Since drill rigidity and space for chip conveyance have to be a compromise a theoretical expression is deduced which enables optimum chip disposal capacity to be described in terms of drill parameters. This expression is used to describe the flute heel side. Another main objective is to study the effect on drill performance of changing the conventional drill flute. Drills were manufactured according to the new flute design. Tests were run in order to compare the performance of a conventional flute drill and non conventional design put forward. The results showed that 50% reduction in thrust force and approximately 18% reduction in torque were attained for the new design. The flank wear was measured at the outer corner and found to be less for the new design drill than for the conventional one in the majority of cases. Hole quality, roundness, size and roughness were also considered as a further aspect of drill performance. Improvement in hole quality is shown to arise under certain cutting conditions. Accordingly it might be possible to use a hole which is produced in one pass of the new drill which previously would have required a drilled and reamed hole. A subsidiary objective is to design the form milling cutter that should be employed for milling the foregoing special flute from drill blank allowing for the interference effect. A mathematical analysis in conjunction with computing technique and computers is used. To control the grinding parameter, a prototype drill grinder was designed and built upon the framework of an existing cincinnati cutter grinder. The design and build of the new grinder is based on a computer aided drill point geometry analysis. In addition to the conical grinding concept, the new grinder is also used to produce spherical point utilizing a computer aided drill point geometry analysis.
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Zhang, Qiang Mechanical & Manufacturing Engineering Faculty of Engineering UNSW. "A study of high performance twist drill design and the associated predictive force models." Awarded by:University of New South Wales. Mechanical and Manufacturing Engineering, 2007. http://handle.unsw.edu.au/1959.4/31220.
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This thesis presents a detailed analysis of the plane rake faced drill design, its grinding method and grinding wheel geometry. A fundamental geometrical analysis has then been carried out on the major cutting edges of the modified drills according to the national and international standards. It has been shown that this new drill design results in a significant increase in the normal rake angle at lips as well as point relieving at the chisel edge region. Geometrical models for the various drill point features have been established which uniquely define the drill point features of the modified drill design. A comprehensive experimental investigation has been carried out to study the drilling performance of the modified drills, when drilling a high tensile steel, ASSAB 4340, with TiN coated high speed steel drills over a wide range of drilling conditions. Comparing to the drilling performance with conventional twist drills under the corresponding conditions, it has been found that the modified drills can reduce the thrust force by as much as 46.9% with the average of 23.8%; the reduction of drilling torque is also significant at an average of 13.2% and the maximum of 24.9%. Similarly, the new drill design shows great superiorities over the conventional drills in terms of drill-life. In the drill-life tests, a few conventional drills were broken, but all plane rake faced drills performed very well. In order to estimate the cutting performance in process planning on a mathematical and quantitative basis when drilling with the modified drills, predictive cutting force models have been developed based on the unified-generalized mechanics of cutting approach. The models have been assessed qualitatively and quantitatively and showed good agreements with the experimental thrust, torque and power. Empirical-type force equations have also been developed to provide simple alternatives for practical applications.
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Erturk, Mehmet Cihan. "Production Performance Analysis Of Coal Bed Methane, Shale Gas, Andtight Gas Reservoirs With Different Well Trajectories And Completiontechniques." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615510/index.pdf.
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The large amount of produced oil and gas come from conventional resources all over the world and
these resources are being depleted rapidly. This fact and the increasing oil and gas prices force the
producing countries to find and search for new methods to recover more oil and gas. In order to meet
the demand, the oil and gas industry has been turning towards to unconventional oil and gas reservoirs
which become more popular every passing day. In recent years, they are seriously considered as
supplementary to the conventional resources although these reservoirs cannot be produced at an
economic rate or cannot produce economic volumes of oil and gas without assistance from massive
stimulation treatments, special recovery processes or advanced technologies.
The vast increase in demand for petroleum and gas has encouraged the new technological development
and implementation. A wide range of technologies have been developed and deployed since
1980. With the wellbore technology, it is possible to make use of highly deviated wellbores, extended
reach drilling, horizontal wells, multilateral wells and so on. All of the new technologies and a large
number of new innovations have allowed development of increasingly complex economically
marginal fields where shale gas and coal bed methane are found.
In this study, primary target is to compare different production methods in order to obtain better well
performance and improved production from different types of reservoirs. It is also be given some
technical information regarding the challenges such as hydraulic fracturing and multilateral well
configuration of the unconventional gas reservoir modeling and simulation. With the help of advances
in algorithms, computer power, and integrated software, it is possible to apply and analyze the effect
of the different well trajectories such as vertical, horizontal, and multilateral well on the future
production performance of coal bed methane, shale gas, and tight gas reservoirs. A commercial
simulator will be used to run the simulations and achieve the best-case scenarios. The study will lead
the determination of optimum production methods for three different reservoirs that are explained
above under the various circumstances and the understanding the production characteristic and profile
of unconventional gas systems.
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Pelley, Dean. "Performance of twin falls davit & lifeboat evacuation system in extreme seas /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,169027.
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Chiu, Chung-man. "A Hong Kong study of the effectiveness of speed drilling in improving reading performance of Chinese dyslexic children." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B29791650.
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Bhudwannachai, Pipat. "Performance evaluation and analysis of the use of CO2 cooling for conventional drilling of carbon fibre reinforced plastics." Thesis, University of Warwick, 2014. http://wrap.warwick.ac.uk/66880/.
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Machining defects induced by conventional drilling of carbon fibre reinforced plastics (CFRPs), of which the most concern is delamination damage both to the surface of the component and to the machined surface of the hole, usually occur due to the heterogeneity and anisotropic properties of the material. Among previous research work on conventional drilling of CFRPs, attempts to minimise delamination damage have focused on the optimisation of tool material, geometry and cutting parameters. Although the application of cryogenic cooling has been shown to improve performance in metal machining, there has been little research work reported on its application to conventional drilling of CFRPs. Therefore, the objectives of this research were to evaluate the application of cryogenic cooling, for which CO2 was used as the main cutting fluid, in conventional drilling of CFRPs and present a detail explanation of the effect on machining performance and mechanism associated with cryogenic machining of these materials. Drilling experiments with liquid nitrogen (LN2) pre-cooled tools, with CO2 cooling and when machining dry at room temperature were performed on CFRPs (carbon/epoxy) plaques using TiAlN and diamond coated solid tungsten carbide drills. The performance evaluation was based on measurement of thrust force, tool wear and delamination damage to the entry/exit of the hole and internal damage to machined surface of the hole. Cutting temperature and characteristics of machined surface (fracture behaviour of carbon fibres and epoxy matrix) produced when drilling with cryogenic cooling and dry at room temperature were also investigated. In this research, it was found that application of cryogenic cooling (LN2 pre-cooling and CO2 cooling) to conventional drilling of CFRPs resulted in an improvement in machining performance with respect to quality of the hole. Less exit delamination damage and internal damage to machined surface of the hole were produced when machining with cryogenic cooling compared to room temperature dry drilling. However, the use of cryogenic cooling in conventional drilling of CFRPs did not improve machining performance with respect to cutting forces and tool wear. In fact, it resulted in higher thrust force and average flank wear compared to machining dry at room temperature. The reduction of delamination and internal damage and the increase of thrust force and rate of tool wear were found to be due to the higher abrasiveness, strength and stiffness of CFRP plaques that were retained during drilling with cryogenic cooling. The cutting temperature was shown to be lower than room temperature dry drilling due to the more effective removal of heat from the cutting zone. It was shown that the cutting temperature was reduced by 14-27% when drilling with cryogenic cooling, for which the use of a CO2 cooling system provided the highest cooling ability, at a cutting speed and feed rate of 100 m/min and 0.06 mm/rev respectively. It was shown that drilling with cryogenic cooling resulted in a more brittle fracture behaviour and less thermal softening of the epoxy matrix in CFRP plaques compared to that produced by room temperature dry drilling. This indicates higher strength and stiffness of the epoxy matrix that were retained during drilling with cryogenic cooling hence resulting in higher abrasiveness, strength and stiffness of the plaque due to more rigid support of the matrix. Since the drilling-induced damage, which was shown in previous research work to degrade the mechanical properties and performance of CFRP components, was reduced, the application of cryogenic cooling can therefore be beneficial when implemented in conventional drilling of CFRPs to improve productivity. However, tool material has to be optimised to compensate with shorter tool life due to increased rate of tool wear. Although no significant difference in thrust force was produced when drilling with CO2 cooling and when drilling with a LN2 pre-cooled tool at the same cutting speed and feed rate, less damage to the machined surface was produced when drilling with CO2 cooling. This was found to be due to higher capability in reducing the cutting temperature than LN2 pre-cooling of the tool. Therefore, the application of cryogenic cooling by continual supply of CO2 (or LN2) is more preferable and more practical to be implemented in the production process in industry than cryogenic pre-cooling of the tool.
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Pederick, Stuart. "Investigation of the effect of waterjet created slots in improving the performance of tricone drill bits in hard rock /." [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18616.pdf.
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Alabdulkarim, Saad A. "Assessing the Relationship between Occupational Injury Risk and Performance: the Efficacy of Adding Adjustability and Using Exoskeletons in the Context of a Simulated Drilling Task." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/89485.
Full textAbstract:
Work-related musculoskeletal disorders (WMSDs) continue to occur despite an increasing understanding of the risk factors that initiate these disorders. Ergonomics is commonly seen as a health and safety approach that has no influence on performance, a perspective potentially hindering intervention proposals in practice. Highlighting potential performance benefits can facilitate intervention cost-justification, along with the traditional focus on reducing exposure to injury risk.
The main objective of this research was to examine the dual influences (i.e., on performance and injury risk) of two distinct types of interventions: adding adjustability, as a commonly advocated approach when considering ergonomics early in the (re)design phase to change task demands; and using exoskeletons to enhance worker capacity. A simulated drilling task was used, which was considered informative as it entailed diverse demands (precision, strength, and speed) and permitted quantifying two dimensions of task performance (productivity and quality).
The dual influences of three levels of workstation adjustability were examined first; increasing adjustability improved performance, with this benefit occurring only when a given level of adjustability also succeeded in reducing ergonomic risk. Across examined conditions, several significant linear associations were found between risk (e.g., Strain Index score) and performance metrics (e.g., completion time), further supporting an inverse relationship between these two outcomes. The dual influences of three distinct passive exoskeletal designs were investigated/compared subsequently, in a simulated overhead drilling task and considering the potential moderating effects of tool mass and precision requirements. Specific designs were: full-body (Full) and upper-body (Arm) exoskeletons with attached mechanical arms; and an upper-body (Shl) exoskeleton providing primarily shoulder support. Both designs with mechanical arms increased static and median total muscle activity while deteriorating quality. The Shl design reduced shoulder loading while increasing dominant upper arm loading and deteriorating quality in the highest precision requirements. Influences of both increasing precision and tool mass were fairly consistent across the examined designs. As such, no single design was obviously superior in both physical demands and performance. Although future work is needed under more diverse/realistic scenarios, these results may be helpful to (re)design interventions that achieve dual benefits on performance and injury risks.PHD
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Ugwoha, Ezedimbu. "Performance of uncoated carbide tools in face turning of titanium base, Ti-6246 alloy and when drilling sintered nickel-base, RR1000 alloy." Thesis, London South Bank University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.618691.
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Manikonda, Nikhil. "Performance of Deep Geothermal Energy Systems." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23219.
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Geothermal energy is an important source of clean and renewable energy. This project deals with the study of deep geothermal power plants for the generation of electricity. The design involves the extraction of heat from the Earth and its conversion into electricity. This is performed by allowing fluid deep into the Earth where it gets heated due to the surrounding rock. The fluid gets vaporized and returns to the surface in a heat pipe. Finally, the energy of the fluid is converted into electricity using turbine or organic rankine cycle (ORC). The main feature of the system is the employment of side channels to increase the amount of thermal energy extracted. A finite difference computer model is developed to solve the heat transport equation. The numerical model was employed to evaluate the performance of the design. The major goal was to optimize the output power as a function of parameters such as thermal diffusivity of the rock, depth of the main well, number and length of lateral channels. The sustainable lifetime of the system for a target output power of 2 MW has been calculated for deep geothermal systems with drilling depths of 8000 and 10000 meters, and a financial analysis has been performed to evaluate the economic feasibility of the system for a practical range of geothermal parameters. Results show promising an outlook for deep geothermal systems for practical applications.
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Malý, Martin. "Analýza řezivostnich vlastností řezných nástrojů povlakovaných PVD povlaky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417590.
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In this diploma thesis, literary research about drilling and coating technology focused on PVD coatings was performed. Furthermore, there is an overview of cutting materials. In the experimental part of the work, the attention is dedicated to tests of twist drills from cemented carbide and high-speed steel materials. For these drills, the feed force Ff and the cutting moment Mc were measured when drilling into austenitic stainless steel. At the end of this work, the technical and economic evaluation of the practical part is presented.
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Larsson, Rickard. "Development and application of a tool for assessing the impact of failure modes on performance of underground drill rigs." Thesis, Örebro universitet, Institutionen för naturvetenskap och teknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-93415.
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Trends such as increasing awareness of sustainable production, shorter product life cycles and personalised products create challenges for the mining industry. A solution to these challenges may be a functional product business model, where the provider sells the hardware’s function under a service contract and is responsible for delivering the combination of hardware and services over the duration of the contract. Under a functional product contract, it is of great importance to predict the availability performance of the hardware. For the mining company to strengthen its competitiveness even further, the reliability and maintainability are also crucial factors to reduce costs, maximise profits, minimise downtime, and improve forecasting of operating hours. The feasibility of performance modelling would be increased if it could be performed by a tool.In prior research related to the reliability of mining vehicles in underground mines, a research gap for drilling rigs was identified. The aim of the thesis was to build a prototype tool and develop a realistic test case to apply it to as a demonstration of how it can help mining vehicle (drilling vehicle) providers understand the impact of their failure modes, particularly from the perspective of providing those vehicles under functional product contracts. The focus was to develop a tool that can be accessible for decision makers within mine operating and mine vehicle provider companies who are not specialists in reliability and maintenance modelling.A simulation model was developed in JaamSim, a graphical user interface developed in Qt designer and the integration between them developed in the Python programming language. A realistic test case was constructed with the purpose of imitating a jumbo drill rig, specifically the Boomer M2 manufactured by Epiroc, used to develop tunnels in an underground mine. Three critical failure modes of the Boomer M2 were identified. Simulations of the test case show that the bent boom arm failure mode had greatest influence on the availability of the drill rig.The developed prototype tool demonstrates the value of decision support tools for measuring the impact of failure modes on functional product contracts and its potential for aiding their negotiation and adoption. The tool has a low complexity regarding usage which should increase its usefulness for decision makers. To increase the tools usefulness further, extending its flexibility of application to other mining vehicles and different maintenance policies has been identified as the next steps for future work.Key words:
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Пестунов, В. М., В. В. Свяцкий, Л. П. Свяцкая, V. Pestunov, V. Sviatskyi, and L. Sviatska. "Увеличение производительности процесса глубокого сверления изменением пространственного положения инструмента." Thesis, Publishing House „Education and science” s.r.o, 2009. http://dspace.kntu.kr.ua/jspui/handle/123456789/6503.
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Рассмотрена модульная система привода для глубокого сверления, позволяющая снизить составляющие технологической нагрузки и расширить технологические возможности процесса. The modular drive system for deep drilling, which allows to reduce the components of the technological load and expand the technological capabilities of the process, is considered.
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Fredriksson, Mikael, Elin Åkerlund, Jakob Åberg, Patrik Österberg, and Rebecka Havo. "High Performance Steel for Percussive Drilling." Thesis, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-323789.
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Atlas Copco Secoroc AB are searching after new bulk materials for drill heads that are used in percussive drilling in order to improve their strength and durability. The aim of this project is to assist Atlas Copco in this search and provide them with further information regarding material properties, alloying elements, suppliers, etc. A literary study was carried out in order to identify materials that had UTS and KIC more than or equal to 1700 MPa and 70 MPa*m^1/2, respectively. Materials that fulfilled these criteria were T250 grade maraging steel, Cobalt free maraging steel, High cobalt maraging steel, 300 grade maraging steel, AerMet 100, AF1410, S53, M54, 300M, 4340M and PremoMet. These were categorized into maraging steels, high alloy secondary hardened steels, and low alloy steels, and were then further researched. The material with the highest combination of UTS and KIC was M54 followed by AerMet 100; while AF1410 had the highest KIC but a low UTS, and PremoMet had the highest UTS but a low KIC. Maraging steels and HASH steels have a similar price range, while low alloy steels are much cheaper.
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Kraussman, Andrew. "The Use of WBM to Improve ROP in HTHP/Hard Rock Environments." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9318.
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Modern day oil & gas well costs are driven by drilling performance as time becomes the dominant capital expense source. The ability to lower drilling costs becomes paramount when tight economic margins and high uncertainties/risk exist. Penetration rate decreases drastically in ultra deep formations, and substantial time is spent drilling the deepest section of these wells. Therefore, significant cost savings may be obtained through an improvement in penetration rate in deep formations. This paper shows that in HTHP (High Temperature High Pressure) hard shale/sand environments that PDC (Polycrystalline Diamond Compact) bits paired with water based mud experience 88% improvement in penetration rate than those paired with oil based mud. With this improvement in drilling rate, well costs can be substantially reduced making future ultra-deep hydrocarbon accumulations economically producible. Also observed was a drastic decrease in penetration rate in PDC bits with oil base mud which led to the use of diamond impreg bits, as the water base with PDC still maintained respectable penetration rates. The conventional penetration rate controls are still applicable in this case, but there exists a fundamental difference between the rock/fluid interactions of each mud type. Bit type, operating conditions, formation characteristics, and bit hydraulics are shown to not be the dominant influencing factor of this performance trend. The water base fluids examined have higher filtrate rates than the oil base fluids. However, a consistent data set of increasing filtrate rate corresponding to increasing penetration rate cannot be derived. Therefore filtration characteristics remain as a possible and partial influencing factor behind this data. Future experimental research is needed to confirm or disprove this theory. At this time the actual cause of this behavior is unknown, however the trend has been established showing water base drilling fluids performance versus oil base in the HTHP/hard rock environment.
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De, Almeida Jose Alejandro. "Methodology for Predicting Drilling Performance from Environmental Conditions." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8808.
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The use of statistics has been common practice within the petroleum industry for
over a decade. With such a mature subject that includes specialized software and
numerous articles, the challenge of this project was to introduce a duplicable method to
perform deterministic regression while confirming the mathematical and actual
validation of the resulting model. A five-step procedure was introduced using Statistical
Analysis Software (SAS) for necessary computations to obtain a model that describes an
event by analyzing the environmental variables. Since SAS may not be readily available,
the code to perform the five-step methodology in R has been provided.
The deterministic five-step procedure methodology may be applied to new fields
with a limited amount of data. As an example case, 17 wells drilled in north central
Texas were used to illustrate how to apply the methodology to obtain a deterministic
model. The objective was to predict the number of days required to drill a well using
environmental conditions and technical variables. Ideally, the predicted number of days
would be within +/- 10% of the observed time of the drilled wells. The database created
contained 58 observations from 17 wells with the descriptive variables, technical limit
(referred to as estimated days), depth, bottomhole temperature (BHT), inclination (inc),
mud weight (MW), fracture pressure (FP), pore pressure (PP), and the average,
maximum, and minimum difference between fracture pressure minus mud weight and
mud weight minus pore pressure. Step 1 created a database. Step 2 performed initial statistical regression on the
original dataset. Step 3 ensured that the models were valid by performing univariate
analysis. Step 4 history matched the models-response to actual observed data. Step 5
repeated the procedure until the best model had been found. Four main regression
techniques were used: stepwise regression, forward selection, backward elimination, and
least squares regression. Using these four regression techniques and best engineering
judgment, a model was found that improved time prediction accuracy, but did not
constantly result in values that were +/- 10% of the observed times.
The five-step methodology to determine a model using deterministic statistics
has applications in many different areas within the petroleum field. Unlike examples
found in literature, emphasis has been given to the validation of the model by analysis of
the model error. By focusing on the five-step procedure, the methodology may be
applied within different software programs, allowing for greater usage. These two key
parameters allow companies to obtain their time prediction models without the need to
outsource the work and test the certainty of any chosen model.
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Burman, Reeti R. "Performance assessment of Ongrade(tm) horizontal directional drilling method." 2009. http://digital.library.okstate.edu/etd/Burman_okstate_0664M_10274.pdf.
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Lin, Yi-Hun, and 林誼涵. "Optimal Drilling Parameters in the 7075 Aluminum Alloy and Using Coated Cutter for Enhancement of Drilling Performance." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/w6u3w3.
Full textAbstract:
碩士龍華科技大學
機械工程系碩士班
105
The 7075 aluminum alloy has been widely used in aerospace, marine automobile and mineral industries, due to their excellent properties such as light weight, high strength and relatively good resistance to corrosion and fatigue. In the work, preliminary experiment was conducted to determine the optimum point angle and clearance angle in drilling7075 aluminum alloy. Using the Taguchi quality design concept, an L9 (33) orthogonal array, signal-to-noise ratio and analysis of variance were employed to examine the performance of the drilling operations. As a result, the spindle speed is the most significant factor for the holes enlargement, roundness, and surface roughness. This study obtains the multiple performance characteristics for drilling operation using grey-Taguchi analysis. In the confirmation runs, showed the lowest holes enlargement about 134 μm, the roundness about 81 μm, and the surface roughness about Ra=0.89 μm. In order to study the machining characteristics for drilling7075 aluminum alloy, TiN and TiAlN nitride thin films (thickness of ~400 nm and ~390 nm) were coated onto the surface of drill tool using magnetron sputtering. The experimental result shows that, with a nitride thin films coating produces a smaller holes enlargement, roundness and surface roughness. Further, in order to easy remove the chip, the drilling performance characteristics are improved by the inverted drilling.
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Chen, Hung-Che, and 陳弘哲. "The Studies of the Influence of Grinding Parameters on the Drilling Performance and Drilling Quality By Taguchi Method." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/74388624374470736974.
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碩士中原大學
機械工程研究所
92
In the past, the key point of drill fabrication was focused on how to select proper parameters to apply to different materials. In addition, the most of the time we considered the drilling geometry and the relation between Drilling Geometry and Drilling Force. But people less mentioned about the drill grinding parameters for the selection of grinding wheel, modification of grinding wheel, times of grinding and usage of grinding liquid which would influence the drilling capacity and drilling quality. This research was subject to the parameters of drill grinding to apply Taguchi Method to plan the drill-grinding test. To use the tooling grinding machine equipped with drill enclosed with grinding drill, also to use multifunction tooling machine to process (drill) the low carbon object, and analyze the different parameters of drill grinding influence the drilling capacity and drilling quality. Although we reduced the testing times and still can get the result data to do analyzing from the testing arrangement fixed according by Taguchi Method and referring the SN Ratio Assistant table to obtain the most proper parameters of driller. Furthermore, to know how they affect to the result from various testing factors of the drilling ability experiment and drilling quality experiment by means of the Analysis of Variance. The last, we used the most proper conditions and factors to do reconfirming test. To compare with the forecast value of this project, the repeat was still in the 3.61％∼24.5％ range.
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Ferreira, Erik Jorge Silva. "Hole cleaning performance monitoring during the drilling of directional wells." Master's thesis, 2012. http://hdl.handle.net/10362/13808.
Full textAbstract:
During drilling operation, cuttings are produced downhole and must be removed to avoid issues which can lead to Non Productive Time (NPT). Most of stuck pipe and then Bottom-Hole Assembly (BHA) lost events are hole cleaned related. There are many parameters which help determine hole cleaning conditions, but a proper selection of the key parameters will facilitate monitoring hole cleaning conditions and interventions.
The aim of Hole Cleaning Monitoring is to keep track of borehole conditions including hole cleaning efficiency and wellbore stability issues during drilling operations. Adequate hole cleaning is the one of the main concerns in the underbalanced drilling operations especially for directional and horizontal wells.
This dissertation addresses some hole cleaning fundamentals which will act as the basis for recommendation practice during drilling operations. Understand how parameters such as Flowrate, Rotation per Minute (RPM), Rate of Penetration (ROP) and Mud Weight are useful to improve the hole cleaning performance and how Equivalent Circulate Density (ECD), Torque & Drag (T&D) and Cuttings Volumes coming from downhole help to indicate how clean and stable the well is.
For case study, hole cleaning performance or cuttings volume removal monitoring, will be based on real-time measurements of the cuttings volume removal from downhole at certain time, taking into account Flowrate, RPM, ROP and Drilling fluid or Mud properties, and then will be plotted and compared to the volume being drilled expected. ECD monitoring will dictate hole stability conditions and T&D and Cuttings Volume coming from downhole monitoring will dictate how clean the well is. T&D Modeling Software provide theoretical calculated T&D trends which will be plotted and compared to the real-time measurements. It will use the measured hookloads to perform a back-calculation of friction factors along the wellbore.
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Munoz, Principe Henry Edinson. "Rock strength and deformability characterisation and assessment for drilling performance estimation." Thesis, 2017. http://hdl.handle.net/2440/104725.
Full textAbstract:
Rock drilling and cutting is essential in the mining industry. Rock characterisation and classification methods have been proposed to assess drilling or cutting performance. However, a unique method to relate rock characteristics to rock cutting performance has not yet been developed. This is due to the complexity of interactions among the variables involved in the drilling process encompassing not only rock properties, but also the nature of drilling. Cost-effective drilling is achievable by allocating the available gross energy towards the drilling action and, at the same time, reducing systematically that energy consumed in frictional processes inherent to tool-rock interactions. Several attempts have been made to assess drilling performance by correlating different rock properties with the drilling rate. For instance, rock texture, grain size, Unconfined Compressive Strength (UCS), Mohs hardness and rock mass structural parameters, and others have been used to build a number of drillability indices. However, not only rock properties, but also different sets of drilling parameters and drilling techniques have an impact on the drilling performance and efficiency of the process. On one hand, to predict rock drilling performance and optimisation of drilling operation, tool-rock interaction laws, i.e. the relations between forces acting on the tool in contact with rock, are essential. For instance, through tool-rock interaction laws, it was found that during rotary drilling, the energy consumed in pure cutting action of rock is measured by the intrinsic specific energy. In the case of percussive drilling, tool-rock interactions are focused mostly in the prediction of the penetration rate and the optimum thrust. On the other hand, rock failure characterised by rock brittleness is a concept yet to be investigated as there is not a unique criterion able to describe rock brittleness quantitatively nor consensus about the most suitable and reliable brittleness index to apply to different rock engineering works encountered in the field. A new brittleness index upon fracture strain-energy quantities extracted from the area under complete stress-strain curve of rocks in uniaxial compressive tests is proposed herein to study drilling performance by rock brittleness capacity. This brittleness index takes into account post-peak instability in uniaxial compression as post-peak instability of rock during compression can be treated as a manifestation of rock brittleness. That is, an increase in the post-peak energy indicates an increase of stability (i.e. a decrease in brittleness or increase in ductility). In the same manner, a dramatic decrease of post-peak energy indicates less stability of the failure process (i.e. an increase in brittleness). In this view, advanced laboratory experiments on strength and deformability of soft-to-hard rock types (UCS is ranging from 7 to 215 MPa) were carried out. The compressive tests complied with the application of a prescribed constant lateral strain-rate as a feedback signal to control the axial load which was found to be a suitable loading rate to measure the complete stress-strain response for the rocks. The new brittleness index developed herein describes a monotonic and unambiguous scale of brittleness with increasing pre-peak strength parameters such as crack damage stress and peak stress as well as deformation parameters such as the tangent Young’s modulus of rock. This outcome becomes relevant in order to better understand material brittleness associated with the progressive fracture process characterised by the typical threshold damage stresses, peak stress and the elasticity parameters. The brittleness index scale indicates that a higher brittleness index means that rock is more brittle which corresponds to higher strength rocks. In order to reliably estimate drilling performance both tool-rock interaction laws along with a proper rock brittleness index are required to be implemented. In this study the performance of a single PDC (Polycrystalline Diamond Compact) cutter cutting and different drilling methods including PDC rotary drilling, roller-cone rotary drilling and percussive drilling were investigated. To investigate drilling performance by rock strength properties, laboratory PDC cutting tests were performed on soft-to-hard rocks to obtain cutting parameters. In addition, results of laboratory and field drilling on different rocks found elsewhere in literature were used. Laboratory and field cutting and drilling test results were coupled with values of a new rock brittleness index proposed herein and developed upon energy dissipation extracted from the complete stress-strain curve in uniaxial compression. To quantify cutting and drilling performance, the intrinsic specific energy in rotary-cutting action, i.e. the energy consumed in pure cutting action, and drilling penetration rate values in percussive action were used. The results show that the new energy-based brittleness index successfully describes the performance of the studied cutting and drilling methods.Thesis (Ph.D.) (Research by Publication) -- University of Adelaide, School of Civil, Environmental and Mining Engineering, 2017.
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Lee, Sang Jo. "The influence of drill characteristics and entry mechanisms on drilling performance." 1986. http://catalog.hathitrust.org/api/volumes/oclc/13685513.html.
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Thesis (Ph. D.)--University of Wisconsin--Madison, 1986.Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 148-152).
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HUANG, HONG-CAN, and 黃宏燦. "Study on the geometrical parameters and drilling performance of multifacet drill (MFD)." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/35582759709782494324.
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"A review of the specific performance characteristics of hard rock tunnel boring machines." Thesis, 2015. http://hdl.handle.net/10210/14510.
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M.Ing.This dissertation provides a review of the most notable papers published with regard to the specific performance characteristics of Tunnel Boring Machines (TBM's) during the past twenty years. It is a literature study of a Bibliography of 57 publications, which were screened from an original list of 970 documents ...
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Chen, Hsing-Wen, and 陳興文. "The High-Speed Drilling Performance of PCB Micro-Drill with Different Geometry Design." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/16103510019302899481.
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碩士國立中正大學
機械系
90
Abstract The high-speed micro-hole drilling is one of the major processes of printed circuit board(PCB) fabrication. The quality of the process is very important to gold-coated disposal and the others. In drilling, the micro-drill contacts with PCB directly resulting in cutting effect on it. Drill bit geometry design is an important factor for drilling efficiency. The parameters of drill bit geometry design are complex and correlated with each other. Due to small diameter and high aspect ratio, the strength and rigidity of micro-drill becomes weak. In this research, point angle, helix angle, web thickness and chisel edge angle are four important design parameters of the drill bit geometry. Using partial factor design of experiment and the method of variance analysis, one can obtain the interaction relationship among design parameters, drilling force, wear, and PCB hole position accuracy. For three-axis resultant force analysis, the point angle has the highest variance and its contribution is 65.32% here. Meanwhile, the interaction effect between point angle and helix angle is the most significant. The smaller point angle is and the bigger helix angle is, the better the result is. But when point angle is bigger, the smaller helix angle is the best choice. As for torsion analysis, the interaction between point angle and chisel edge angle is very obvious and their contribution is 31.54% here. When the point angle is smaller and chisel edge angle is bigger, the torsion is the smaller. But when point angle is bigger, the chisel edge angle is not significant. However, the chisel edge angle should be smaller in this situation. In factorial experiment and analysis of wear, when the web thickness and the chisel edge angle are designed to be smaller, wear rate will reduce. Although the contribution of the point angle is only 0.003174%, the interaction effect between point angle and web thickness is very obvious. In order to reduce wear rate, point angle should be designed bigger. As for the analysis of hole position accuracy, the contribution of the helix angle is the most significant. The bigger point angle is, the worse hole position accuracy is. The interaction effect between helix angle and chisel edge angle is more obvious than the others. The smaller helix angle is and the bigger chisel edge angle is, the better hole position accuracy is. The results can be utilized in the micro-drill geometry design and determination of geometry parameter designed in new type micro-drill. It takes least time and money to develop micro-drill. In addition, researcher in micro-drill geometry design can fit more levels to the obvious effective factors in the beginning of the drilling experiment. The interaction effect of factor and each other can be considered at the same time. They can improve drill efficiency and the high-speed drilling performance of PCB. Keywords: high-speed drilling, micro-drill, drill bit geometry design, interaction effect, drill force, wear, hole position accuracy
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Hood, Michael. "A study of methods to improve the performance of drag bits used to cut hard rock." Thesis, 2015. http://hdl.handle.net/10539/18193.
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Coddou, Ginny Anne. "Drilling performance improvement : Brett and Millheim model adaptations for interaction effects and multiple learners." Thesis, 2012. http://hdl.handle.net/2152/29155.
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This work reviews concepts in drilling-based learning curves and proposes modifications to the Brett and Millheim learning curve model to enable its use for multiple learners and to characterize interaction effects between learners. Enabling the model’s use for multiple learning scenarios at once improves modeling efficiency. Interaction effects are present when learners improve from their own experience and the experience of those in close proximity to them. Quantifying interaction effects leads to a more complete understanding of performance improvement and enables more effective forecasting of drilling resources and expenditure requirements.text
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Hsieh, Min-Hsiung, and 謝銘雄. "The Performance Analysis and Experiment Studies of Precise Positioning System for PCB Drilling Machine." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/03460381672932362050.
Full textAbstract:
碩士大葉大學
機械工程研究所
87
The purpose of the thesis is researched the performance analysis and experiment studies of precise positioning system for PCB drilling machine. Then, the complete analysis technique will be established. First, To analyze the basic characteristics include stiffness and load capacity of aerostatics bearing. Second, The stiffness sees to linear of gad film at clearance inside. The eight-degree of free model (x、y、z、α、β、γ、px1、px2)of aerostatics guide with its equation of motion is formulated. The equations are decoupled to derive the dynamic characteristics of aerostatics guide. Then, the dynamic response performance is experiment measured. Make use of the ANSYS software progress and compare with the modal analysis and modal testing data. The results of the theory and experiment are all examined. Finally, Establish the certain the theory''s rationality and validity.
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Joshi, Raunak, and 羅傑. "Evaluation of laser-assisted Scribing and Drilling performance using Ytterbium laser for semiconductor materials." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/j4aah2.
Full textAbstract:
碩士南臺科技大學
電機工程系
106
Laser scribing and drilling of materials plays a critical factor in semiconductor, electronics and packaging industry. Research and development in these industries are booming since last decade. Lasers used in the industries are very expensive and requires very high maintenance. Along with these problems, the efficiency of the laser is lower than the price paid for it. The main factors for considering the availability of different types of lasers are scribing and drilling. Power, frequency and wavelength of the laser are key factors to carry out scribing and drilling process on different types of material. The main purpose of this thesis is to propose a new model which could replace the existing system keeping the efficiency, cost of production and maintenance in consideration. Ytterbium laser possesses better features because of its higher efficiency and low cost. Along with these advantages, there are a few disadvantages associated with it. This thesis will tackle these problems during the system setup. The main problem with ytterbium laser is alignment as this laser belongs to infrared region and is not visible to human eyes. Alignment of the laser is important because it is directly proportional to the efficiency of the laser. The proper alignment shows a significant increase in efficiency and could be vice versa. A new property of ytterbium laser has been found during the alignment process in this thesis. Ytterbium laser when comes in contact with aluminum nitride produces a green light because of reaction between laser and surface of aluminum nitride. As ytterbium laser is invisible, this property helped us to know the exact position of laser and also helped in the alignment process. This thesis also compares experimental results between ytterbium and diode pumped solid state laser. The wavelength of ytterbium laser is 1064 nm and the wavelength of diode pumped solid state laser is 355 nm. Laser with higher wavelength possesses wider beam width. Scribing and drilling experimental results is the base for comparison between lasers. Ytterbium laser is proved to have several advantages over diode pumped solid state laser. First, Ytterbium laser is cheaper and requires less maintenance than conventional laser. The other is that its laser beam with higher wavelength can scribe deeper into opaque materials like aluminum nitride and silicon. Experiments are conducted with two different types of laser. As a result, ytterbium laser proved to have better depth and width. It could also be used for drilling applications which were not possible with diode pumped solid state laser. In this thesis, we explore the correlation between the transparency of an object and the wavelength. When the wavelength of the laser is in infrared zone there is no reflection at surface of the wafer.
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Chen, Mei-Yin, and 陳美吟. "The Study of Using Predict Support System to Promote the Parallel Drilling Machine Production Performance." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/m5e6gd.
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碩士國立高雄應用科技大學
工業工程與管理系碩士班
103
The basic structure of buildings is composed of reinforce, Earthquakeshappened in Taiwan are frequent, steel building strength affects public safety and property, because of few Iron ore resources in our country, we have imported steel materials from abroad, so the sale price is often subject to international iron ore price change impact, this situation is very unfavorable for the steel industry. In this study, we chose the most common number of H-beam processing drilling process to discuss after we analysis the problem of iron and steel industry. After collecting all of the processing information, we use the Multiple Regression Analysis to solve the problem of the data, also we use the EXCEL software package to establish a forecasting support system, to help the company management to estimate the production time to lay the standard production volume and reward system. By empirical results that, if the individual job performance as a production line operator's incentive target will award by the Improshere plan to work appropriately, this reward performance measure is mainly aimed at the working hours and personal productivity. The study was concluded, the number of hours of work and drilling to grow in a linear fashion, for example work situation in August at machine A ,the employees can get 4,901 dollar as a reward.
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Chen, Ming-Shan, and 陳明山. "The drilling performance and hole quality of multilayer diamond-like carbon deposited on micro-drill." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/98817249896773949509.
Full textAbstract:
碩士建國科技大學
自動化工程系暨機電光系統研究所
101
The study is to research the drilling performance of a-C:H:Zr coatings prepared by sputtering graphite ,zirconium targets ,CH4 and C2H2 used unbalanced magnetron sputtering system. The stusy contains three stages .The objective is study the influence of Zr target current on the drilling properties of coatings in the first stage. It change the interlayer was from one multilayer to four multilayer in the second stage. Base on the second stage, results the coating hardness is low. In order to improve the hardness, the coating have been designed a multilayer structure. It contain both hard and soft layer in the multilayer coating in the third stage. The drilling performance of the coated micro-drills is evaluated by conducting high-speed through-hole drilling tests using printed circuit board (PCB) specimens. The service life of the coated micro-drills is assessed utilizing three different criteria, namely the nail head ratio, surface roughness of the drilled hole, and diameter of drilled hole, respectively. The result display that the S3 coating process the test drilling performance and the highest drilling life time. It can improve the life time of drilling above 6000 holes drilled.
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Wang, Yi-Hang, and 汪逸涵. "Tribological and drilling performance of DLC films with changed DC power frequency and substrate bias voltage." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/94825563531028923246.
Full textAbstract:
碩士國立成功大學
機械工程學系碩博士班
97
The main purpose of this study is to research the tribological properties and cutting performance of a-C:H coatings prepared by sputtering graphite and Zirconium targets with unbalanced magnetron sputtering system. It contains two stages of research in the study. We focus the influence of DC power frequency on the properties of coatings in first stage. We change the bias voltage of substrate to get various substrate bias voltage of coatings in second stage. In first stage, We change the frequency of DC power to get various frequency films structure for a-C:H coatings. We confer in what kind of parameter had the best tribological performance and use SRV to study the resistant abrasion of films. The films cross-section and wear surface analysis be used by SEM and EDS. Through the research of the first stage we know that the hardness of the coatings decrease and the adhesion of the coatings increase with the 70KHz. After SRV tribological test we verify that the coating prepared under the 70KHz has highest wear resistance and adherent properties. We got coatings with substrate bias voltage range from 42 to 62 in second three stage. Through the study we can know that low substrate bias voltage contributes to the adhesion of the coatings and the coatings have the lower friction coefficient and higher wear resistance. Then we will be use Raman Spectroscopy observed the variety of sp3/sp2 bond proportion of films structure and G、D peak position deflection to compare the result of resistance wear test. Finally, we would obtain the best DC power frequency for apply cutting tool and PCB drilling needle as the same as SRV test results that DC power frequency for 70KHz better than other value. The suitable DC power frequency and low substrate bias voltage promote the tool life and wear resistance properties.
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Lynk, John Michael. "Performance of drag embedment anchors dragged through remolded clay and loaded at various horizontal orientations." Thesis, 2009. http://hdl.handle.net/2152/ETD-UT-2009-12-697.
Full textAbstract:
Drag embedment anchors (DEAs, or anchors) are used as foundations to secure mobile offshore drilling units (MODUs) in soft clay soils on the sea floor. In 2004 and 2005, Hurricanes Ivan, Katrina, and Rita caused the mooring failures of 17 mobile offshore drilling units moored with anchors. Since then, a great deal of research has been conducted regarding anchor performance and reliability. This report provides an overview of anchor research and industry practice to date, and discusses the results of two research experiments to assess anchor performance. One experiment investigated the effect that embedding anchors in the same soil path several times had on bearing force. The second experiment investigated what effect changing the direction of the horizontal load vector relative to the anchor shank had on embedded anchor bearing force. The results of these experiments suggest that remolding clay may have an effect on anchor bearing force capacity, and that repeatable results are obtainable when testing the effect of changing the direction of applied horizontal load.text