Готові списки джерел за темами / Sliding sleeve

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Добірка наукової літератури з теми "Sliding sleeve"

Автор: Grafiati

Опубліковано: 11 березня 2023

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Статті в журналах з теми "Sliding sleeve"

Shi, Lei, Xing Jiu Zhong, Jun Wu, and Bin Li. "Research on the Technology of RFID Sliding Sleeve." Applied Mechanics and Materials 496-500 (January 2014): 1552–55. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.1552.

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There is a very significant application today towards multiple zone fracturing operations in a horizontal well of low permeability reservior all over the world. But the number of the ball seat activated sliding sleeves that can be run in a well is limited because of the design and cant meet the need of volume fracturing in low permeability reservoir; Also the sleeves can only be shifted by CT, which extend the length of the operation and add to the overall costs. This paper introduces a kind of sleeve which is controlled by RFID and meet the need of volume fracturing, the number of sleeves that can be run in a well using this technology is essentially unlimited and can be operated remotely[1-3]. It is eay to operate and no intervention; It is proved by field test that this sleeve is reliable and can meet the field application.

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Shang, Xiao Feng, Yang Wang, and Wei Dong Deng. "Sliding Sleeve Fracturing Strength Analysis of the Ball Based on Ansys Workbench." Applied Mechanics and Materials 423-426 (September 2013): 1914–19. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.1914.

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In the oilfield development, the packer is one of important downhole tool in oilfield drilling technology, and sealing effect of the sliding sleeve fracturing ball system directly affect the packer's sealing performance. Using UG software to establish 3D sliding sleeve fracturing ball and base model. Based on Ansys workbench simulation platform, finite element analysis was carried out on the sliding sleeve fracturing ball, distribution pattern in different materials, and sealing effect. Fracturing experiments were done to verify the accuracy of the simulation analysis and ensure the sliding sleeve fracturing system reliability in practical work.

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Ding, Kun, Jian Min Li, Wen Xin Yang, Jian Hu, and Wei Zeng. "Numerical Simulation of Erosion Wear of Liquid-Solid Two-Phase Flow in Sliding Sleeve of Horizontal Well." Advanced Materials Research 988 (July 2014): 483–88. http://dx.doi.org/10.4028/www.scientific.net/amr.988.483.

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In recent years, the pitching sliding sleeve staged fracturing technology of open hole packer of horizontal well is widely used in shale gas, dense reservoirs, low permeable reservoirs and other exploration and development fields, and becomes the important means of present oil-gas field stimulation. But in the construction process of horizontal well fracturing, the abnormal condition that the sliding sleeve is not opened or is opened invisibly is occurred repeatedly, which has big impact on the fracturing construction. Based on fluid dynamics method and Finnie micro-cutting theory, this paper simulated the erosion wear rate of ball seat at the different fracturing segments. The results showed that: the construction displacement has big impact on the erosion wear, followed by the particle size of proppant and sand ratio, wherein the erosion wear is in inversely proportional to the particle size of proppant; and when multistage fracturing, the possibility that the sliding sleeve close to the toe end and heel happens erosion destruction is much less than that of sliding sleeve in the middle.

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Xu, Daping, Yingxin Yang, and Qiming Cheng. "Theoretical and Experimental Research on the Floating-Sleeve Bearing Applied in Roller-Cone Bit." Shock and Vibration 2019 (March 26, 2019): 1–11. http://dx.doi.org/10.1155/2019/9719750.

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In oil and gas drilling, the roller-cone bit and the hybrid bit configured with roller cones are two commonly used rock-breaking tools; however, service lives of the bits are limited by the sliding bearings therein. In order to improve the performance and reliability of the bearing in the roller cone, a novel bearing with a floating sleeve is researched in this paper. Firstly, motion characteristics of the bearing are researched, and motion relations between the elements in the bearing are analyzed, respectively. Then, on the basis of the motion relations, three motion statuses of the float sleeve are clarified, including the sleeve start to rotate, the sleeve rotates stably with the pushing force exerted by the rollers, and the sleeve rotates stably with the opposing force exerted by the rollers. At last, bearing performances in three different conditions are respectively tested in the experiment. The results, with the specific speed value being in the range of 0.375∼0.833 and the average value in 0.613∼0.618, show that the sleeves with 6∼12 rollers are able to start and rotate stably under 5 kN radial load, indicating that the sleeves can be started to rotate and work stably, whereas, for the sleeve with less than 4 rollers, the specific speed value varies in the large range of 0∼1.176, indicating that this sleeve cannot rotate stably in the bearing. This research revealed that the amount of rollers is an important factor that determines whether the sleeve is able to float stably in the bearing; therefore, roller quantity should be focused in the bearing design to optimize its performance.

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Wiśniewska-Weinert, H. "Surface Modification Of The High Temperature Porous Sliding Bearings With Solid Lubricant Nanoparticles." Archives of Metallurgy and Materials 60, no. 3 (September 1, 2015): 2209–14. http://dx.doi.org/10.1515/amm-2015-0366.

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Abstract A surface modification of stainless steel bearing sleeves is developed to improve the tribology characteristics at high temperature. Solid lubricant nano- and microparticles are applied for this purpose. To create the quasi-hydrodynamic lubrication regimes, the solid lubricant powder layer is made by developed pressure impregnation technique. Porous sliding bearing sleeve prototypes were made by powder metallurgy technique. The purpose of the paper is to define the friction and wear characteristics of the sleeves and to determine the influence of sealing of the sliding interface on these characteristics. It is found that application of WS2 sold lubricant nano- and micro-particles and preservation of a particle leakage out of interface allows to achieve at the high temperature the friction coefficients comparable to those at ambient temperature.

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Yang, Fuqin, Xin Liu, Shun Zhao, and Linlin Sun. "Fluid-solid coupling characteristics analysis for tripod sliding universal joints." Mechanics & Industry 20, no. 2 (2019): 201. http://dx.doi.org/10.1051/meca/2019001.

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Fluid-solid coupling theory is introduced into tripod sliding universal joint design. The geometric models of the tripod sliding universal joint and lubricant film are established respectively and meshed. Fluid-solid coupling analyses of tripod sliding universal joints in unidirectional and bidirectional scenarios are performed to investigate sleeve and lubricant film coupling as well as sliding pin and lubricant film coupling under various differential pressures and frequencies. In the condition of unidirectional and bidirectional coupling, sleeve and sliding pin deformation and stress increase gradually with differential pressure and frequency. Under various differential pressures and frequencies, tripod sliding universal joint bidirectional coupling deformation and stress are greater than those of unidirectional coupling. The theory of fluid-solid coupling is combined with the tripod sliding universal joint for the first time in this paper. The fluid-solid coupling analysis results are of great significance and benefit to the design, application and marketing of tripod sliding universal joints.

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Žegarac, Nikola. "Analysis of influencing factors that can cause errors in the application of modern methods of sliding bearing diagnostics in machine and electrical systems." Vojnotehnicki glasnik 68, no. 4 (2020): 845–76. http://dx.doi.org/10.5937/vojtehg68-27265.

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Анотація:

Introduction/purpose: The paper presents the application of modern methods in the diagnostics of sliding bearings and the analysis of influencing factors that can cause errors in such an application. Possibilities to determine with certainty when and where problems affect sliding bearings during system operation are presented. It is also shown how the system will continue to function over time. Causes of failures and the manner of their elimination are predicted, as well as the time for planned maintenance of technical systems. Method: The new method solves the problem of sliding bearing diagnostics by measuring the dynamic trajectories of the sleeve in the sliding bearing and by measuring vibration parameters on the inner and outer surfaces of the technical system. The dynamic trajectories of the bearing sleeve are measured with non-contact probes; therefore, the centering of probes in relation to the geometric center of the bearing is very important. Vibration parameters, directly related to the clearance in the sliding bearing, are measured on the inner and outer surfaces of the system. The choice of vibration parameters and measuring points is very important. This method has a number of advantages over other diagnostic methods, as it is easy to access measuring points. Results: By measuring the dynamic trajectory of the sleeves in the plain bearing and vibration parameters on the inner and outer surfaces, the bearing clearance quantities are determined, including: normal condition, initial clearance size, its further increase, bearing clearance sizes, and the moment when the condition parameters are close to the upper limit of the permissible bearing clearance. Conclusion: New diagnostic methods and monitoring systems can be widely applied to: internal combustion engines, all piston machines, hydroelectric power plants, thermal power plants, processing plants, and many other systems.

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Li, Ruolan, Dongsheng He, and Lang Xiong. "Study on the Cone Angle of Sliding Sleeve Ball Seat in Open Hole Staged Ball Throwing Fracturing." Academic Journal of Science and Technology 3, no. 2 (October 28, 2022): 161–66. http://dx.doi.org/10.54097/ajst.v3i2.2162.

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In the ball type fracturing sliding sleeve, the contact surface between the ball socket and the fracturing ball is the most vulnerable part to failure. Once the contact surface fails, the sealing of the fracturing sliding sleeve will fail, the fracturing fluid will leak, and finally the fracturing will fail. The contact condition between the ball socket and the fracturing ball is mainly determined by the cone angle of the ball socket. In order to improve the contact condition between the ball socket and the fracturing ball as much as possible, and extend the service life of the sliding sleeve, based on fluid erosion and finite element structural analysis, this paper has carried out the analysis of the cone angle of the fracturing sliding sleeve. Firstly, the erosion of the ball seat is analyzed, and the erosion rate of the ball seat under different cone angles is obtained. The conclusion is that the erosion rate of the ball seat is proportional to the cone angle of the ball seat. Combined with the working conditions of the ball socket fracturing, the finite element analysis of the ball socket structure is carried out, and the stress conditions of different cone angles are compared. Finally, combined with the erosion rule and force analysis of the ball socket, the optimal cone angle of the ball socket is 20 °. When the cone angle of the ball socket is 20 °, the force of the ball socket meets the strength requirements of the ball socket, and can obtain a higher service life.

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Yang, Fuqin, Jingwei Jiang, Dong Li, and Linlin Sun. "Analysis of fluid–solid coupling characteristics of tripod sliding universal coupling based on cavitation and thermal effects." Advances in Mechanical Engineering 12, no. 5 (May 2020): 168781402092007. http://dx.doi.org/10.1177/1687814020920073.

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Анотація:

In this article, a fluid–solid coupling analysis of tripod sliding universal coupling and lubricating oil film was conducted by taking into consideration cavitation and thermal effects. The coupling of the sleeve and slip pin with the lubricant oil film under different pressure differences and frequencies was investigated. Moreover, the study results were compared with the results of fluid–solid coupling under the ideal condition of negligible cavitation and thermal effects. When considering these effects, the deformation and stress values of the sleeve and the slip pin gradually increase as the pressure difference and frequency increase. The deformation and stress values of the sleeve are reduced relative to the calculation results of fluid–solid coupling in ideal conditions. However, the values of the slip pin are increased. Furthermore, when considering the thermal effect, the deformation and stress differences for the sleeve and slip pin decrease as the pressure difference increases. The stress difference of the sleeve grows sharply, whereas the deformation difference of the slip pin increases only slightly as the frequency increases.

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CAI, YONGQING. "EFFECTS OF THE INSERTION OF AN ARCHWIRE THIN-WALLED SLEEVE IN ACCELERATING THE CANINE’S TRANSLATION." Journal of Mechanics in Medicine and Biology 20, no. 09 (September 7, 2020): 2040009. http://dx.doi.org/10.1142/s0219519420400096.

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In sliding mechanics, resistance to sliding (RS), including friction, binding, and notching, generated at a wire-bracket interface has a bearing on the force transmitted to the teeth and further influences the biomechanical behavior associated with tooth movement efficiency. Objective: This study aimed to propose and verify the insertion of a rectangular thin-walled sleeve between an archwire and a bracket to minimize the resistance effect on the biomechanical behavior of tooth movement by using the finite element (FE) method. Material and methods: A 3D FE solid model was constructed and composed of mandibular dentitions, including the surrounding tooth-supporting structures and fixed self-ligating appliances. The translation of the left mandibular canine was simulated (0.1[Formula: see text]mm and 0.3[Formula: see text]mm) from the labial side to the lingual side with or without the thin-walled sleeve by using eight kinds of archwires with various dimensions and cross-sections by FE methods. Results: FE analysis indicated that the canine’s maximum initial displacement and the highest periodontal ligament (PDL) von Mises stress were mainly influenced by the orthodontic wire and the insertion of the thin-walled sleeve. Without the thin-walled sleeve, rectangular archwires could initiate a more optimal tissue response than round archwires. However, the insertion of the thin-walled sleeve between the small round archwire and the bracket significantly presented the most optimal biological responses in all of the cases. Conclusion: FE results revealed that the insertion of a thin-walled sleeve in a small round archwire and a bracket could have a positive influence on final tooth movement.

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Більше джерел

Дисертації з теми "Sliding sleeve"

Koutsogiannakis, Panagiotis. "Dynamics and instability of flexible structures with sliding constraints." Doctoral thesis, Università degli studi di Trento, 2022. https://hdl.handle.net/11572/362124.

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Анотація:

Although instabilities and large oscillations are traditionally considered as conditions to be avoided in structures, a new design philosophy based on their exploitation towards the achievement of innovative mechanical features has been initiated in the last decade. In this spirit, instabilities are exploited towards the development of systems that can yield designed responses in the post-critical state. Further, the presence of oscillating constraints may allow for a stabilization of the dynamic response. These subjects entail a rich number of phenomena due to the non-linearity, so that the study of such mechanical systems becomes particularly complex, from both points of view of the mechanical modeling and of the computational tools. Two elastic structures are studied. The first consists of a flexible and extensible rod that is clamped at one end and constrained to slide along a given profile at the other. This feature allows one to study the effect of the axial stiffness of the rod on the tensile buckling of the system and on the compressive restabilization. A very interesting effect is that in a region of parameters double restabilization is found to occur, involving four critical compressive loads. Also, the mechanical system is shown to work as a novel force limiter that does not depend on sacrificial mechanical elements. Further, it is shown that the system can be designed to be multi-stable and suitable for integration in metamaterials. The second analyzed structure is a flexible but inextensible rod that is partially inserted into a movable rigid sliding sleeve which is kept vertical in a gravitational field. The system is analytically solved and numerically and experimentally investigated, when a horizontal sinusoidal input is prescribed at the sliding sleeve. In order to model the system, novel computational tools are developed, implementing the fully nonlinear inextensibility and kinematic constraints. It is shown that the mathematical model of the system agrees with the experimental data. Further, a study of the inclusion of dissipative terms is developed, to show that a steady motion of the rod can be accomplished by tuning the amplitude or the frequency of the sliding sleeve motion, in contrast with the situation in which a complete injection of the rod inside the sleeve occurs. A special discovery is that by slowly decreasing the frequency of the sleeve motion, the length of the rod outside the sleeve can be increased significantly, paving the way to control the rod’s end trajectory through frequency modulation.

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Частини книг з теми "Sliding sleeve"

Zhang, Hong-yan, Xiao-cui Xu, Li Ban, Chun-hui Zhang, Jin-you Wang, Xiu-hong Chen, Qing-bo Mao, and Mu-lin Cheng. "Research and Application of Pressure Balanced Sliding Sleeve Fracturing Technology with Casing Cementing in Low Permeability Oil Reservoirs." In Springer Series in Geomechanics and Geoengineering, 119–27. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2485-1_13.

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Ding, Kun, Jianmin Li, Ning Cheng, Haiyan Zhao, Shanzhi Shi, and Liring Wang. "Application of staged fracturing technology by using a ball injection sliding sleeve for horizontal wells’ open-hole completion in Block Ma 131." In Advances in Energy Science and Equipment Engineering II, 203–6. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781315116167-41.

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Тези доповідей конференцій з теми "Sliding sleeve"

Getzlaf, Nick, Rio Whyte, Mike Vanee, Stanley Mberia, Brock Gillis, and Michael Werries. "Effect of Formation Compaction and Subsidence on Sliding Sleeve Performance." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210433-ms.

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Анотація:

Abstract Formation compaction and subsidence forces due to reservoir drawdown have the potential to inhibit the function of sliding sleeves and similar completion systems. The sliding sleeves discussed have the ability to be opened and closed multiple times, allowing for flexible stimulation and production operations. Field data suggested a link between high sliding sleeve function forces and preceding zonal production. The objective was to minimize these effects to give the operator full functionality of the sliding sleeves over the life of the well. This paper will outline how this was achieved, and the results of comparative lab testing. The overall approach was to (1) understand the magnitude and effects of the formation forces, (2) implement product improvements, and (3) validate results through lab testing the proposed solutions. A case study was conducted for 4.5 in. 21.5 lb/ft & 5.5 in. 32.6-35.3 lb/ft casing and sliding sleeves installed in the Valhall field. Wells drilled in the Valhall field had previously suffered production casing collapse failures due to formation compaction and subsidence (Pattillo and Kristiansen 2002). Switching to the current heavy weight casing resolved the issue. The heavy weight casing collapse pressure ratings were used in the early analysis to determine maximum uniform collapse resistance and radial deformation of the sliding sleeve components. Thick-walled cylinder calculations were insufficient for predicting the effect of the non-uniform loading exhibited downhole, as well as predicting metal-to-metal contact within the sliding sleeves due to abrupt changes in geometry. FEA modelling was completed for predicting metal-to-metal contact due to a non-uniform load. Sleeves with improved mechanical collapse resistance were designed and built. Lab testing was conducted by applying a mechanical radial force simulating the formation load to (1) the original sleeves, (2) the newly improved sleeves, and (3) host casing samples. Sliding sleeve performance was assessed through the resultant opening and closing forces. Test results verified the model for radial deformation due to formation forces, and the effect on sliding sleeve performance. The improved sleeves showed no change in performance with a range of applied radial load, whereas the original sleeves showed significant increases in function force. Completion design improvements can enable novel methods of well stimulation and production in areas prone to formation compaction and subsidence forces. These forces can have major effects on the completion and production of a well but are rarely quantified and accounted for in sliding sleeves or similar completion systems designs. At the time of writing, the improved sliding sleeves have been successfully run in a field trial, though did not produce prior to functioning.

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Rule, William Keith. "Modeling of Sleeved Taylor Impact Specimens." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-1824.

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Recently experimental studies have been conducted using a novel form of the Taylor impact test consisting of sleeved cylinders. A soft material of known properties (OFHC Cu) was used for the core and the tight fitting sleeve was fabricated from the material of interest (AF1410 steel). On impact the mushrooming and sliding core places the sleeve in a stress state not normally found in Taylor impact testing. This paper describes a study conducted to evaluate the feasibility of backing out Johnson-Cook strength model coefficients from measured (post-test) deformed geometries of sleeved specimens using an explicit impact code (EPIC). In addition, modifications to the sleeved concept geometry (tapered and capped core) are also explored numerically as well as the sleeve/core sliding friction coefficient.

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Zheng, Lichen, Yang Gao, Qinghai Yang, Xiaohan Pei, and He Liu. "Controllable Sliding Sleeve Fracturing Technology." In SPE Asia Pacific Oil & Gas Conference and Exhibition. Society of Petroleum Engineers, 2014. http://dx.doi.org/10.2118/171450-ms.

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Lichen, Zheng, Yu Jiaqing, Wang Yucai, Gao yang, Pei Xiaohan, and Liu He. "Active Tag Control Sliding Sleeve Fracturing Technology." In SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition. Society of Petroleum Engineers, 2017. http://dx.doi.org/10.2118/186407-ms.

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Mauchien, Thomas, Sharat Kishore, Amanda Olivio, and Mostafa Ahmed. "Efficiently Shifting Sliding Sleeves in Extended Reach Horizontal Wells with Electric-Line: A Case Study." In SPE/ICoTA Well Intervention Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204400-ms.

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Abstract Traditional intervention operations with coiled tubing (CT) in extended reach horizontal wells might be difficult to access due to lockup from frictional forces and operational inefficiencies. Using conventional shifting tools requires multiple runs to shift open and close multiple sliding sleeve doors (SSD). This paper is a case study of an electric-line powered shifting intervention operation to shift open an SSD, circulate fluids though the sleeve and into the annulus, and then close and repeat this for another SSD in a long horizontal well—all in a single run. The paper discusses the different methods that can be used to efficiently seek and latch onto the shifting profiles using a tractor, wireline cable, and the shifting tool itself with an inchworm motion. The electric-line shifting tool monitored and verified the opening and closing of the sleeves in real time using its onboard sensors. These techniques were effectively deployed in multiple wells that required the annulus to be displaced with fluid after running smart completions. The completions were installed in the well with the SSDs in a closed position, and the shifting intervention consisted in opening the SSD, pumping fluids through the sleeve, and closing the SSD. The tool was anchored in place in the wellbore during the entire circulating operation, and the SSD was subsequently closed. This operation was then repeated on the second SSD in the wellbore, and the entire operation was completed in a single run. Also, no additional caliper run was needed as the shifting tool verified the position of the SSDs. These methods were used in a long horizontal well with the help of real-time measurements. The tool measurements identified if the SSDs were in open or closed position or anywhere in-between. The shifting tool provided confirmation via its measurements that the sleeve was not partially open. This was particularly important when pumping fluid through the annulus to achieve the maximum flow through the sleeve. Operating using electric-line was extremely efficient and eliminated the need to perform multiple runs, thus achieving time savings on the rig. This is the first time that a paper discusses the different seek methods that can be used for carrying out a electric-line mechanical intervention operation. It represents a novel method using a shifting tool as a caliper to probe and measure the completion inner diameter changes while seeking for the profile. It provides a valuable method for reliably and confidently locating and latching onto a shifting profile. Finally, this is the first time that a paper correlates the theoretical mechanics of shifting a sliding sleeve with consistent results from system integration tests and downhole measurements from the real job.

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Merron, Matt, Zachary Walton, and Michael Fripp. "Electronic Sliding Sleeve for Unlimited Zone Multistage Completion System." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2017. http://dx.doi.org/10.2118/187204-ms.

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Ramanathan, Venky, Cole Mombourquette, Alberto Martinez, and Sean Borschneck. "Innovative Applications of Oil Soluble Tracers in Unstimulated & Stimulated Multi-Stage Horizontal Wells for Long Term Flow Assurance and Production Monitoring." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210270-ms.

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Abstract Sliding sleeves have been an integral part of horizontal multistage completions, however intelligent sleeves that provide reservoir insights were missing or cost prohibitive. This led to the innovative development of integrating oil soluble tracer applications with sleeve technology to provide superior completions and reservoir diagnostics. Conceived to validate flow in unstimulated wells / stages, the longevity and value of the data collected led to extending this application for long term flow assurance monitoring of unstimulated and stimulated wells. Spinner based production logging techniques require intervention and have limited capability in wells with artificial lift. Tracer sleeve integration requires zero intervention and builds on the back of proven tracer diagnostics, and field proven sleeve technologies. A winning combination for production operation optimization. The monitoring feature is especially useful in wells that are put on production prior to stimulation. These applications effectively allow for flow assurance and production profiling between unstimulated and stimulated traced stages. Fluid samples are collected at surface for a period of several months, over which time trend fluctuations in tracer concentrations are monitored and evaluated. Reservoir intelligence that production engineers can act on is now available at their fingertips. With more than two-hundred-fifty (250) installations on multiple wells during the first year of application, tracer sleeves have become part of the standard operating process. Results obtained over a multitude of study wells have indicated that tracer sleeve technology provides effective monitoring of both the relative flow contribution, and flow assurance of each traced stage for the subject wells. Studied wells were monitored for periods no shorter than three (3) months following initial production, and in most cases continued to display detectable readings from tracer sleeves well over nine (9) months. This has also led to lower intervention costs and limiting the number of interventions to wells that show unsatisfactory tracer concentrations. In conclusion this diagnostic approach has provided validation and insight for wells or regions of a lateral where previously, flow contribution and productivity were assumed. The introduction of oil soluble tracers into production sleeve technology has allowed for short- and long-term diagnostics (flow assurance and production monitoring) of hydrocarbon contribution in unstimulated and stimulated regions of horizontal multi-stage wells in a hybrid completion. A superior diagnostic solution where cost prohibitive or intervention options were the only available alternative.

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Freire Rigatto da Cruz, Suellen, Rodrigo Tavares, Rodrigo Maciel, Lucas Zampirole Brandão, Fabio de Assis Ressel Pereira, Bruno Loureiro, and Andre Martins. "EXPERIMENTAL AND NUMERICAL INVESTIGATION OF THE FLOW IN SLIDING SLEEVE VALVES." In 18th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2020. http://dx.doi.org/10.26678/abcm.encit2020.cit20-0424.

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Correa, Rubens, and Carolina Latini Cova. "Completion of Successful Multistage Sliding Sleeve Fracpack in the Campos Basin." In OTC Brasil. Offshore Technology Conference, 2017. http://dx.doi.org/10.4043/27954-ms.

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Zhu, Muzhi, Shengdun Zhao, and Dafei Bao. "An Adaptive Integral Sliding Mode Control for the Sleeve Angle of a Novel Rotary Valve and its Experimental Study." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10810.

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Abstract In this paper, an adptive integral sliding mode control (AISMC) based on extended state observer (ESO) is proposed for the valve sleeve angle posotion control of a novel rotary valve for the first time. The novel rotary valve is designed for the electro-hydraulic transmission system with high frequency and flow especially adopted in the fatigue testing machine, and the unique valve structure and working principle is presented firstly to achieve the sleeve angle control model for the design of tracking controller. In order to obtain continuous reference trajectory and ensure control performance for integrel sliding mode, a third-order differentiator is designed and verified by matlab/Simulink simulation shows accurately tracking performance. To validate the excellence of the AISMC based on ESO, The spool position tracking experiment is also carried out on the test bench and the results show higher position tracking effectiveness and disturbance robustness compared with the PID controller.

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