Relevant bibliographies by topics / Simulations; formation damage

Academic literature on the topic 'Simulations; formation damage'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Simulations; formation damage"

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Lohne, Arild, Liqun Han, Claas van Zwaag, Hans van Velzen, Anne-Mette Mathisen, Allan Twynam, Wim Hendriks, Roman Bulgachev, and Dimitrios G. Hatzignatiou. "Formation-Damage and Well-Productivity Simulation." SPE Journal 15, no. 03 (May 20, 2010): 751–69. http://dx.doi.org/10.2118/122241-pa.

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Summary In this paper, we describe a simulation model for computing the damage imposed on the formation during overbalanced drilling. The main parts modeled are filter-cake buildup under both static and dynamic conditions; fluid loss to the formation; transport of solids and polymers inside the formation, including effects of porelining retention and pore-throat plugging; and salinity effects on fines stability and clay swelling. The developed model can handle multicomponent water-based-mud systems at both the core scale (linear model) and the field scale (2D radial model). Among the computed results are fluid loss vs. time, internal damage distribution, and productivity calculations for both the entire well and individual sections. The simulation model works, in part, independently of fluid-loss experiments (e.g., the model does not use fluid-leakoff coefficients but instead computes the filter-cake buildup and its flow resistance from properties ascribed to the individual components in the mud). Some of these properties can be measured directly, such as particle-size distribution of solids, effect of polymers on fluid viscosity, and formation permeability and porosity. Other properties, which must be determined by tuning the results of the numerical model against fluid-loss experiments, are still assumed to be rather case independent, and, once determined, they can be used in simulations at altered conditions as well as with different mud formulations. A detailed description of the filter-cake model is given in this paper. We present simulations of several static and dynamic fluid-loss experiments. The particle-transport model is used to simulate a dilute particle-injection experiment taken from the literature. Finally, we demonstrate the model's applicability at the field scale and present computational results from an actual well drilled in the North Sea. These results are analyzed, and it is concluded that the potential effects of the mechanistic modeling approach used are (a) increased understanding of damage mechanisms, (b) improved design of experiments used in the selection process, and (c) better predictions at the well scale. This allows for a more-efficient and more-realistic prescreening of drilling fluids than traditional core-plug testing.
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Ding, D. Y. Y. "Modeling Formation Damage for Flow Simulations at Reservoir Scale." SPE Journal 15, no. 03 (May 20, 2010): 737–50. http://dx.doi.org/10.2118/121805-pa.

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Summary Formation damage generally is limited to the immediate nearwellbore region and needs a particular near-well-flow modeling using fine gridblocks. However, near-well models are usually developed as standalone models and are decoupled from reservoir models. Using a standalone near-well model that does not take into account production scenarios cannot predict well injectivity or productivity correctly. In this paper, we propose a new technique for the coupled modeling of a near-well-flow model and a reservoir model in a simple and consistent way. In this new approach, data are exchanged and updated through boundary conditions for the near-well model and through numerical productivity indices (PIs) (or skin factors) for the reservoir model. Examples show that this coupled modeling gives quite satisfactory results.
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Wang, Yitao, Teng Zhang, Yuting He, Jiyuan Ye, Hanzhe Zhang, and Xianghong Fan. "Analysis of Damage of Typical Composite/Metal Connecting Structure in Aircraft under the Influences of High-Velocity Fragments." Applied Sciences 12, no. 18 (September 15, 2022): 9268. http://dx.doi.org/10.3390/app12189268.

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A two-stage light gas gun was used to conduct a high-velocity impact test on the aircraft’s typical composite/metal connecting structure (CFRP/AL). The battle damage simulations used for the CFRP/AL connecting structure were carried out under different intersection conditions. Then, the damage morphology and mechanism of high-velocity prefabricated spherical fragments on typical structures, the dynamic process of hyper-velocity impact, and the formation of debris clouds on the secondary damage morphology of different component structures were investigated. Next, based on the X-ray computerized tomography (CT), the typical mode of different damage areas and evolution trends of CFRP under high-velocity impacts were explored. Finally, a simulation model was established for battle damages of typical structures by combining FEM methods, and structural components’ energy dissipation capabilities for fragments under different velocities were analyzed. The study results provide a reference and model support for the rapid repair of battle-damaged aircraft and aircraft survivability design.
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Voskoboinikov, Roman. "MD simulations of primary damage formation in L12 Ni3Al intermetallics." Journal of Nuclear Materials 522 (August 2019): 123–35. http://dx.doi.org/10.1016/j.jnucmat.2019.05.009.

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Khadke, Aniruddha, Somnath Ghosh, and Ming Li. "Numerical Simulations and Design of Shearing Process for Aluminum Alloys." Journal of Manufacturing Science and Engineering 127, no. 3 (July 21, 2004): 612–21. http://dx.doi.org/10.1115/1.1951787.

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This work combines experimental studies with finite element simulations to develop a reliable numerical model for the simulation of shearing process in aluminum alloys. The critical concern with respect to product quality in this important process is burr formation. Numerical simulations are aimed at understanding the role of process variables on burr formation and for recommending process design parameters. The commercial code ABAQUS-Explicit with the arbitrary Lagrangian-Eulerian kinematic description is used in this study for numerical simulations. An elastic-plastic constitutive model with experimentally validated damage models are incorporated through the user subroutine VUMAT in ABAQUS, for modeling deformation and ductile fracture in the material. Macroscopic experiments with microscopic observations are conducted to characterize the material and to calibrate the constitutive and damage models. Parametric study is done to probe the effect of process parameters and finally, a genetic algorithm (GA) based design method is used to determine process parameters for minimum burr formation.
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Kozlov, Alexander, Andrew V. Martin, and Harry M. Quiney. "Hybrid Plasma/Molecular-Dynamics Approach for Efficient XFEL Radiation Damage Simulations." Crystals 10, no. 6 (June 4, 2020): 478. http://dx.doi.org/10.3390/cryst10060478.

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X-ray free-electron laser pulses initiate a complex series of changes to the electronic and nuclear structure of matter on femtosecond timescales. These damage processes include widespread ionization, the formation of a quasi-plasma state and the ultimate explosion of the sample due to Coulomb forces. The accurate simulation of these dynamical effects is critical in designing feasible XFEL experiments and interpreting the results. Current molecular dynamics simulations are, however, computationally intensive, particularly when they treat unbound electrons as classical point particles. On the other hand, plasma simulations are computationally efficient but do not model atomic motion. Here we present a hybrid approach to XFEL damage simulation that combines molecular dynamics for the nuclear motion and plasma models to describe the evolution of the low-energy electron continuum. The plasma properties of the unbound electron gas are used to define modified inter-ionic potentials for the molecular dynamics, including Debye screening and drag forces. The hybrid approach is significantly faster than damage simulations that treat unbound electrons as classical particles, enabling simulations to be performed on large sample volumes.
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Wu, Shi, Han Cao, Dong Jie Wang, Li Xia Jia, and Yan Kun Dou. "Cascades Damage in γ-Iron from Molecular Dynamics Simulations." Materials Science Forum 993 (May 2020): 1011–16. http://dx.doi.org/10.4028/www.scientific.net/msf.993.1011.

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The degradation of austenitic stainless steels under irradiation environment is a known problem for nuclear reactors, which starts from atoms displacement cascade. Here, molecular dynamics (MD) simulations have been used to investigate the formation of atomic displacement cascade in γ-iron for energies of the primary knock-on atom (PKA) up to 40 keV at 300 K. The number of Frenkel pairs increased sharply until a peak value was reached, which occurred at a time in the range of 0.1-2 ps. After that, a number of defects gradually decreased and became stabilized. Compared with α-iron, there was less defects in the stable stage, and more clustered defects were produced in γ-iron. Within the range of PKA energies, two regimes of power-law energy-dependence of the defect production were observed, which converge on 16.8 keV. The transition energy also marks the onset of the formation of large self-interstitial atom (SIA) clusters and vacancy clusters. Interstitial and vacancy clusters were in the form of Shockley, Frank dislocation loops and Stir-Rod dislocation loops.
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Rahafrooz, M., M. Sanjari, M. Moradi, and Danial Ghodsiyeh. "Prediction of Rupture in Gas Forming Process Using Continuum Damage Mechanic." Advanced Materials Research 463-464 (February 2012): 1047–51. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.1047.

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The Continuum Damage Mechanics is a branch of applied mechanics that used to predict the initiation of cracks in metal forming process. In this article, damage definition and ductile damage model are explained, and also ductile damage model is applied to predict initiation of fracture in gas metal forming process with ABAQUS/EXPLICIT simulation. In this method instead of punch, the force is applied by air pressure. In this study, first the ductile damage criterion and its relations are taken into account and, subsequently, the process of gas-aid formation process is put into consideration and ductile damage model for prediction of rupture area is simulated using ABAQUS simulation software. Eventually, the process of formation via gas on the aluminum with total thickness of 0.24 [mm] was experimentally investigated and the results acquired from experiment were compared with relating simulations. The effect of various parameters such as radius of edge matrix, gas pressure and blank temperature has been evaluated. Simulation was compared with experimental results and good agreement was observed.
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Hu, M. S., M. Y. He, and A. G. Evans. "Solvent-induced damage in polyimide thin films." Journal of Materials Research 6, no. 6 (June 1991): 1374–83. http://dx.doi.org/10.1557/jmr.1991.1374.

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Solvent induced crazes formed in strained polyimide thin films on different substrates have been studied. A fracture mechanics approach has been used to simulate craze evolution. The experiments and simulations have identified a critical prestrain below which craze formation does not occur. This strain decreases with increase in solvent exposure time, but also exhibits a threshold. Diffusion of the solvent into the film is considered to be responsible for the time-dependent nature of damage formation.
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Voskoboinikov, Roman. "Optimal sampling of MD simulations of primary damage formation in collision cascades." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 479 (September 2020): 18–22. http://dx.doi.org/10.1016/j.nimb.2020.06.001.

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Dissertations / Theses on the topic "Simulations; formation damage"

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Zenia, Sofiane. "Modélisation numérique de l’usinage des matériaux composites à matrice polymère et fibres longues de carbone." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0126/document.

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La mise en œuvre des matériaux composites, fait souvent appel à des procédés d’usinage conventionnel, comme l’opération de perçage utilisée lors de l’assemblage de structures par rivetage. Ces opérations peuvent générer dans la pièce usinée différents types d’endommagement: arrachement des fibres, rupture de la matrice, délaminage intralaminaire et interlaminaire, dégradation thermique de la matrice, ce qui peut provoquer une baisse des performances mécaniques de la structure. L’objectif de la thèse est de mettre en place un modèle numérique scientifiquement rigoureux pour analyser l’usinage des composites CFRP et prédire les mécanismes d’endommagement induits par l’outil coupant. Ce modèle basé sur une loi constitutive mésomécanique combine l’effet de la chute de rigidité dans le comportement du matériau, la plasticité, l’initiation et l’évolution de l’endommagement durant le processus d’usinage. Ensuite, deux modèles 2D et 3D adoptant un schéma explicite ont été implémentés via la sub-routine VUMAT dans Abaqus. Le délaminage interplis a été pris en considération à l’aide des éléments cohésifs disponibles dans le code ABAQUS/Explicit. Ce travail a permis de reproduire de manière réaliste les opérations de coupe orthogonale et de perçage des composites CFRP en termes de processus de formation du copeau, la prédiction des forces de coupe et celle de l’endommagement induit. Ces études ont montré que l’orientation des fibres et la profondeur de coupe sont les paramètres les plus influents en coupe orthogonale tandis que pour le perçage se sont les vitesses d’avance et la géométrie des outils
The machining of composite materials is often necessary for material removal operations by cutting tools such as drilling. These operations can generate a lot of damage in the machined workpiece (fiber fracture, matrix craking, intralaminar and interlaminar delamination and thermal degradation of the matrix), which can cause a decrease of mechanical performance of the structure. The PhD thesis objective is to set up a reliable accurate model to analyze the machining of CFRP composites and to predict the different damage modes induced by the cutting tool. This model is based on a mesomechanical constitutive law combining the stiffness degradation concept into the material behavior, the plasticity, the initiation and the evolution of the damage during the machining process. Two 2D and 3D models adopting an explicit scheme were implemented in Abaqus/Explicit analysis code through the user subroutine VUMAT. Furthermore, interlaminar delamination is taken into account using the cohesive elements available in the ABAQUS / Explicit code. This work allowed to realistic numerical simulation of orthogonal cutting and drilling operations of CFRP composites in terms of chip formation process, cutting forces prediction and induced damage. These studies have shown that the fiber orientation and the depth of cut were the most influential parameters in orthogonal cutting while for the drilling process, the feed rate and the tool geometry are the most important parameters
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Nguyen, Thi Kim Phuong. "Reservoir simulation studies of formation damage for improved recovery on oil-gas reservoirs." Thesis, 2011. http://hdl.handle.net/2440/70889.

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This thesis is dedicated to the development of new technologies for sweep improvement due to plugging of highly permeable channels and layers by injected or lifted or mobilized fines particles. The following methods of improved waterflood have been proposed in the thesis: • Injection of raw or poorly treated water with consequent homogenization of the injectivity profile due to distributed along the well skin factor. • Injection of low salinity or fresh water resulting in lifting of reservoir fines, their migration and further capture by the rock with permeability reduction and redirection of the injected water into unswept area. • Injection of sweet water into watered-up abandoned wells during pressure blowdown in oil and gas reservoirs with strong water support. In the above three cases, the proposal of the new technologies was backed by detailed reservoir simulations. In all cases, the application of the proposed improved oil recovery technology, as forecasted by reservoir simulation, leads to 3-15% of incremental recovery and 2-3 times decrease of the amount of produced and injected water. The technology of raw water injection was developed using Eclipse waterflood BlackOil simulator with modelling of injectivity decline along the well due to plugging of porous media by injected particles. A new numerical procedure describing skin growth with time in each section of long horizontal wells have been developed and implemented into BlackOil Eclipse model. Different configurations of horizontal injectors and producers have been modelled resulting in production forecast with raw waterflooding. The technology of low salinity water injection have been developed using Eclipse reservoir modelling with polymer injection option, which can describe mobilization of fines particles, their migration, capture and subsequent permeability decline. The main physics mechanism of incremental oil recovery found is the diversion of the injected water into unswept zones due to plugging the swept zone by capture particles. The incremental recovery, as obtained by reservoir simulation, is 12%. It may also result in 2 to 3 times decrease in water injection and production. The proposal of a new technology of small bank of fresh water injection into watered-up and abandoned production wells result in lifting of reservoir fines, their migration and plugging the path for invaded aquifer water. It results in decrease of water production and prolongation of oil or gas production from wells.
Thesis (M.Eng.Sc.) -- University of Adelaide, Australian School of Petroleum, 2011
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Chen, Di. "Molecular Dynamics Simulation of Damage Cascade Formation in Ion Bombarded Solids." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-10112.

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Presented in this thesis are the results from an integrated experimental and modeling study on damage cascade formation in ion bombarded solids. The molecular dynamics (MD) simulations were performed by using LAMMPS (Large-scale Atomic/Molecular Massively Parallel Simulator). In one subtask, we studied damage cascade interactions caused by two 2 keV Si atoms simultaneously bombarding a crystalline Si substrate. We found that the enhanced displacement creation appears primarily in the thermal spike stage with all atoms at energies less than the displacement threshold. The study lead to the conclusion that the cascade interactions increased local melting by increasing energy deposition density, thus promoting defect creation. In another subtask, we studied radiation damage in Si0.8Ge2 layer caused by Agn clusters with number of atoms in a cluster, n, taking values from 1 to 4. It showed that strained SiGe, a material known to have poor radiation tolerance, still follows the overlap model, rather than the direct amorphization model. In the third subtask, MD simulation has shown that crowdion defects formed in bcc Fe are propagating along <111> directions. Crowdion defect starts to form when damage cascade reaches the maximum volume and contributes a second peak in defect buildups with increasing times. Upon defect recombination, crowdion defects shrink and form <111> oriented dumbbell defects at the crowdion end. In subsequent structural relaxation, <111> dumbbell defects rotate and finally align themselves with <110> directions. The surviving dumbbell defects represent a significant contribution to the final defect distribution after thermal spike formation. The overall research reveals atomic scale details of damage buildups at early stages of defect developments. Although the target systems cover both semiconductor materials and metal, these results show that MD simulation is a powerful tool to show the details at a spatial and time scale beyond experiments. These details are very important to develop understanding the precursor formation in defect clustering in such a case.
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Zeinijahromi, Abbas. "Technologies and mathematical modeling of fines-assisted oil and gas recovery." Thesis, 2012. http://hdl.handle.net/2440/80034.

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This is a PhD thesis by publication. It includes seven published/accepted for publication journal papers and two submitted papers in academic peer reviewed journals. The content of the thesis is also published in ten full volume technical papers of Society of Petroleum Engineering (SPE). The thesis develops a theory for single and two-phase flow in porous media accounting for mobilization, migration, and straining of the natural reservoir fines. This phenomenon has been widely reported in laboratory studies and also well history data. The existing mathematical model, widely used in petroleum reservoir simulation, does not agree with laboratory observations. It contains phenomenological empirical constants which cannot be predicted theoretically. The new closed system of governing equations, proposed in the current thesis, is free of the above mentioned shortcomings. The proposed system contains a new theoretical function describing the rock capacity to liberate fines so-called maximum retention function. This function is based on the micro scale conditions of mechanical equilibrium of fine particles in the porous space. The mechanical equilibrium condition is a torque balance of drag, lifting, electrostatic, gravity, and capillary forces. The maximum retention function is derived for both single-phase and two-phase flows in porous media. The comparison between the modified particle detachment model and the maximum retention function and laboratory and well data has shown a good agreement, which validates the model. An exact analytical solution for single-phase flow in porous media with alternating velocity accounting for fines lifting has been derived, allowing for mathematical description of a laboratory test on the suspension injection into reservoir cores with alternating velocities. Good agreement between the laboratory test results and the mathematical modeling predictions validates the theory developed. Both analytical and numerical models for two-phase flow with induced fines migration have been developed. In reservoir scale approximation, the equivalence between the fines assisted water-flood and adsorption-free polymer flood has been investigated. It allows using the existing commercial simulators to model low salinity water-flood. The results of the modeling allow proposing a new technologically effective and economical method for improved sweep efficiency by fines assisted water-flooding. Moreover, modeling of low salinity water injection shows that permeability reduction due to induced fines migration can slow down the encroaching water in oil/gas reservoir under strong water support. It decreases water production during pressure depletion of oil/gas reservoirs and improves the recovery. Also, a small volume injection of low salinity water can be used to reduce the water conning problem in oil/gas wells and prolong the wells production life.
Thesis (Ph.D.) -- University of Adelaide, Australian School of Petroleum, 2012
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Book chapters on the topic "Simulations; formation damage"

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Simionescu, A., and G. Hobler. "Two Dimensional Monte Carlo Simulation of Ion Implantation in Crystalline Silicon Considering Damage Formation." In Simulation of Semiconductor Devices and Processes, 361–64. Vienna: Springer Vienna, 1993. http://dx.doi.org/10.1007/978-3-7091-6657-4_89.

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Ecke, Martin, Oliver Michael, Markus Wilke, Sebastian Hütter, Manja Krüger, and Thorsten Halle. "Deformation Twinning in bcc Iron - Experimental Investigation of Twin Formation Assisted by Molecular Dynamics Simulation." In Plasticity, Damage and Fracture in Advanced Materials, 43–51. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-34851-9_4.

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Conference papers on the topic "Simulations; formation damage"

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Ding, Yu. "Modeling Formation Damage for Flow Simulations at Reservoir Scale." In 8th European Formation Damage Conference. Society of Petroleum Engineers, 2009. http://dx.doi.org/10.2118/121805-ms.

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Hardy, Mary, and Diederik van Batenburg. "Near-Wellbore Temperature Simulations Assist Design of Water-Shutoff Treatments." In SPE European Formation Damage Conference. Society of Petroleum Engineers, 1997. http://dx.doi.org/10.2118/38196-ms.

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van de Ketterij, R. G., and C. J. de Pater. "Numerical Simulations of Hydraulic Fracture Link-up of Perforations at Deviated Wellbores." In SPE European Formation Damage Conference. Society of Petroleum Engineers, 1999. http://dx.doi.org/10.2118/54751-ms.

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Samaha, A., K. Huang, E. Kasap, T. Shwe, and D. Georgi. "Near Wellbore Permeability and Damage Measurements: Experiments and Numerical Simulations for Interpretation of WFT Data." In SPE Formation Damage Control Symposium. Society of Petroleum Engineers, 1996. http://dx.doi.org/10.2118/35150-ms.

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Alcalde, Osmar Rene, and Lawrence W. Teufel. "Diagnosis of Formation Damage By Rock Deformation/Compaction Through Numerical Well-Test Simulations." In SPE International Symposium and Exhibition on Formation Damage Control. Society of Petroleum Engineers, 2006. http://dx.doi.org/10.2118/98053-ms.

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Mikhailov, D., N. Ryzhikov, A. Makarova, V. Shako, A. Burukhin, and B. Theuveny. "A Method for Determination of Near-wellbore Zone Properties Alteration during Well Drilling, Completion and Cleanup Operations by Combination of Numerical Simulations and Special Experimental Technique." In SPE European Formation Damage Conference and Exhibition. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/174248-ms.

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Fleming, Niall, Knut Taugbøl, Anne-Mette Mathisen, Ove Braadland, and Håvård Kaarigstad. "Completion Damage." In SPE International Conference and Exhibition on Formation Damage Control. SPE, 2022. http://dx.doi.org/10.2118/208843-ms.

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Abstract Formation damage has received significant attention over many years as one of the primary reasons for well productivity impairment, to the detriment of completion damage. The objective of this paper is to redress this imbalance and to focus on the central role that completion damage has on well productivity. Formation damage is a reduction in inflow performance due to damage of the near wellbore, while completion damage is an increased pressure drop effecting the lower completion, e.g., plugging of sand screens. A completion damage classification system is presented for the first time that relates this damage type to lower completion design throughout well lifetime. In addition, a review of some of the fluid qualification tests has been performed. Fluid compatibility. Computational fluid dynamics (CFD) was used to determine the displacement efficiency from drilling to completion fluid in a candidate well, and hence the mixing ratio of drilling fluid to completion fluid to be used in compatibility tests. Furthermore, CFD simulations provided an indication of the likely shear rates occurring during displacement that were later used in the testing. Fluid stability. To determine the influence of sag on fluid displacement efficiency, CFD was used to model the worst-case situation where all the weighting agent came out of suspension. Using the displacement efficiency and shear rates obtained, a new dynamic completion damage test was devised to determine the potential for screen plugging. Finally, an overview will be presented of how Equinor's approach to completion damage has changed because of this study, with increased focus on achieving a better balance in the evaluation of formation and completion damage.
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Sedghi, Mohammad, and Lamia Goual. "Molecular Dynamics Simulations of Asphaltene Dispersion by Limonene and PVAc Polymer During CO2 Flooding." In SPE International Conference and Exhibition on Formation Damage Control. Society of Petroleum Engineers, 2016. http://dx.doi.org/10.2118/179040-ms.

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Kaya, Onur Alp, Ismail Durgut, and Serhat Canbolat. "Numerical Modeling of Waterflooding Experiments in Artificially Fractured and Gel Treated Core Plugs by Embedded Discrete Fracture Model of a Reservoir Simulation Toolbox." In SPE International Conference and Exhibition on Formation Damage Control. SPE, 2022. http://dx.doi.org/10.2118/208874-ms.

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Abstract The fluid flow dynamics of the matrix and fractures are significantly different from each other. Fractures are high-permeability flow channels that serve as the main flow units. On the other hand, the Matrix takes up the majority of the reservoir volume and is generally regarded as the main storage unit. The primary goal of this research is to investigate numerically the effects of fractures and polymer gel treatment on oil recovery during waterflooding of artificially fractured core plugs. In this study, the MATLAB Reservoir Simulation Toolbox (MRST) was used for the numerical solution. Different numerical models were developed using MRST to describe three main cases: non-fractured core plug, fractured core plug, and polymer gel treated core plug. Following the creation of the physical models, 2 PV water was introduced into all core plugs. Oil recovery and water saturation profiles vs. time plots were obtained. The standard Buckley-Leveret solution is utilized to evaluate the numerical model, and the fractures are modeled using the Embedded Discrete Fracture Model (EDFM). The results of the simulations were compared with the results of the experiments. In the experiments, results were recorded after 2 PV water injections. For the polymer gel treated core plugs, 2 PV more water was injected after the polymer gel operation. same injection volumes as used in the MRST model. For an artificially fractured core sample, initial oil recovery was measured as 28.57% experimentally and 28.87% with MRST. Then polymer gel was applied to the core plug, increasing the oil recovery to 42.85% experimentally and to 40.83% with MRST. Similarly, before and after polymer gel operation, mean water saturation was measured as 58.34% and 66.5%, respectively. MRST results showed mean water saturation of 58.38% and 65.45%. It is clear from both numerical and experimental models that the existence of fractures decreases the overall hydrocarbon recovery. Polymer gel treatment decreases fracture permeability, resulting in a more uniform sweep and increased overall recovery. Additional oil recovery was observed after polymer gel treatment. Besides, polymer gel treatment of the matrix is also efficient for increasing the recovery and leads to the same results. Moreover, the effects of the fracture aperture and fracture permeability on the recovery were also investigated. Fracture aperture directly impacts the recovery of the low aperture values when the permeability is constant. Similarly, permeability directly affects recovery for high values when the aperture is constant. Finally, the results showed that experimental and numerical findings are significantly close to each other for all non-fractured, fractured, and polymer gel-treated cases.
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Byrne, Michael, Lesmana Djayapertapa, Ken Watson, Niall Fleming, and Knut Taugbøl. "Understanding Fluid Exchange as Screens are Run in Hole – Mitigation of Formation and Completion Damage Risks." In SPE International Conference and Exhibition on Formation Damage Control. SPE, 2022. http://dx.doi.org/10.2118/208852-ms.

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Abstract To reduce the risk of screen plugging with drilling fluid solids, wellbore fluids are typically displaced to low or no solids systems before sand screen lower completions are run in to wells. Displacing the entire wellbore volume to low solids fluids can add significant cost particularly in high pressure wells. An option can be to displace the open hole section of the well only with the low solids fluid and run the lower completion through the original drilling fluid. A refinement of this process is to fill the upper hole section with the low solids fluid in order to pre-saturate the screens assembly. The movement or exchange of the two fluids as the screens are run in to the wellbore has been a significant uncertainty, until now! This work was conducted to investigate the potential for fluids to exchange as sand screen completions are run in to wells in the Field 1 Satellite and Field 2 developments. The hypothesis that fluids in the wellbore would displace fluids inside the screen assembly as the screens are run in to the well was tested. Computational Fluid Dynamics (CFD) modelling was used to simulate the movement of the lower completion in to the well and determine the rate and quantity of fluid exchange. The simulations demonstrated that when stand alone screen (SAS) completions are run in to wellbores, fluids will exchange from outside to inside the screens. This process happens at all tripping speeds examined and in all parts of the cased and open hole wellbore. The fluid exchange continues throughout the running in process, including in the open hole lower completion. There is no value in filling the top hole section with low solids completion fluid unless fluid exchange during running in can be controlled. When a one-way inflow control device (ICD) check valve is fitted to each screen joint allowing fluid to flow in to the tubing but not back out to the annulus then fluid exchange is significantly limited. Careful consideration should be given to the exchange of fluids as lower completion assemblies are run in to wells. If it is considered undesirable that the fluid in the well should enter the lower completion string as it is run in to the well then appropriate valves or flow reduction should be considered. Eliminating the requirement to fill the top hole section with low solids fluid can lead to significant cost reduction in well where expensive fluids, such as Cs formate, are required to meet the low or no solids specifications. Understanding fluid exchange in wells as screens are run in can significantly reduce the risk of formation/completion damage. The work illustrates the value in a novel application of CFD to determine the optimum well construction process.
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Reports on the topic "Simulations; formation damage"

1

Nema, Arpit, and Jose Restrep. Low Seismic Damage Columns for Accelerated Bridge Construction. Pacific Earthquake Engineering Research Center, University of California, Berkeley, CA, December 2020. http://dx.doi.org/10.55461/zisp3722.

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This report describes the design, construction, and shaking table response and computation simulation of a Low Seismic-Damage Bridge Bent built using Accelerated Bridge Construction methods. The proposed bent combines precast post-tensioned columns with precast foundation and bent cap to simplify off- and on-site construction burdens and minimize earthquake-induced damage and associated repair costs. Each column consists of reinforced concrete cast inside a cylindrical steel shell, which acts as the formwork, and the confining and shear reinforcement. The column steel shell is engineered to facilitate the formation of a rocking interface for concentrating the deformation demands in the columns, thereby reducing earthquake-induced damage. The precast foundation and bent cap have corrugated-metal-duct lined sockets, where the columns will be placed and grouted on-site to form the column–beam joints. Large inelastic deformation demands in the structure are concentrated at the column–beam interfaces, which are designed to accommodate these demands with minimal structural damage. Longitudinal post-tensioned high-strength steel threaded bars, designed to respond elastically, ensure re-centering behavior. Internal mild steel reinforcing bars, debonded from the concrete at the interfaces, provide energy dissipation and impact mitigation.
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