The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Li Chuan-liang - One of the best experts on this subject based on the ideXlab platform.
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Compressibility of Reservoir Rocks——Re-Discussion with Dr Wang Liqiang
Xinjiang Petroleum Geology, 2013Co-Authors: Li Chuan-liangAbstract:The stress relationship equation of reservoir Rocks is that the total stress of reservoir Rocks is a porosity-weighted average of skeleton stress and pore pressure.The stress relationship equation of reservoir Rocks can be used in any state of reservoirs,not only in primary state.But such an equation is not directly used by researchers,while the effective stress equations are commonly used due to impossible measurement of skeleton stress of Rocks.The well known effective stress equations are Terzaghi equation and Biot equation.The theoretical equation of Rock Compressibility derived by the stress relationship equation of reservoir Rocks shows the correct logic relationship,namely,the higher the Rock porosity,the larger the Compressibility.Moreover,when Rock porosity is zero,its Compressibility is zero,too.
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Several Questions About Low-Permeability Reservoirs in Reservoir Engineering—Re-discussion with Mr Dou Hong'en
Xinjiang Petroleum Geology, 2013Co-Authors: Li Chuan-liangAbstract:Several questions about low-permeability reservoirs are re-discussed with Mr Dou Hong'en,such as presence of stress sensitivity,Rock Compressibility,effective stress,starting pressure gradient,porosity invariance principle of reservoir engineering,which are frequently encountered basic concepts and mathematical representations.Correct answers to these questions are of great significance on the reservoir researches and rational development.
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The Formulae of Rock Compressibility of Reservoirs —Reply to Dr Wang Liqiang
Xinjiang Petroleum Geology, 2012Co-Authors: Li Chuan-liangAbstract:The Rock Compressibility measured by volumetric method is usually overvalued,which is caused by the interstices between cores and core sleeves during experiments.The elastic modulus method gets rid of the negative effect of interstices on Rock Compressibility,with which the measurements are much more reasonable.The compression of Rock results from the compression of Rock matrix.The decrease of Rock pore pressure results in the increase of Rock matrix stress,which allows the matrix to be compressed along with the pore volume.Rock matrix can not expand with the decrease of pore pressure.As Rock porosity equals to 0,the pore volume disappears,the Compressibility of Rock pore volume equals to 0 consequently.
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Are low permeability reservoirs very special——Reply to Mr.Dou Hong-en
Special Oil & Gas Reservoirs, 2011Co-Authors: Li Chuan-liangAbstract:There are many misunderstandings about low permeability reservoirs,such as high Rock Compressibility,strong stress sensitivity,threshold pressure gradient and slippage effect,which all are misleading laboratory conclusions,not verified by practice,not scientific cognitions and resulted from experimental errors.A great quantity of production practice has manifested that low permeability reservoirs are not subjected to strong stress sensitivity.Oil and gas can migrate in mudstone source Rock,meaning that threshold pressure gradient does not exist at all.In fact,low permeability reservoirs are not special and have no essential difference with medium-high permeability reservoirs except for lower porosity,poorer physical property,more shale content,and lower productivity.The peculiar phenomena not seen in medium-high permeability reservoirs also will not appear in low permeability reservoirs.
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Low permeability reservoirs should be viewed in scientific perspectives——Reply to Mr. Dou Hong-en
Special Oil & Gas Reservoirs, 2009Co-Authors: Li Chuan-liangAbstract:Many misunderstandings in the study of low permeability reservoirs are resulted from improper experiment means and the lack of rational scientific research method. The high Compressibility and strong stress-sensitivity of low permeability reservoir Rocks are due to the system error in laboratory measurements, but not a manifestation of intrinsic Rock property. The logic inversion of Rock Compressibility has been overcome by a new measurement method. The stress sensitivity of Rock is related to the Compressibility of Rock. Because the Compressibility of Rock is very small, the stress sensitivity is quite weak and can be neglected in production process. Both the threshold pressure gradient and slippage effect are experimental artifact and do not exist actually. There is no essential difference between low permeability reservoir and mid-high permeability reservoir. Those peculiar phenomena not seen in mid-high permeability reservoirs shall not appear in low permeability reservoir.
Chris J. Bromley - One of the best experts on this subject based on the ideXlab platform.
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Rock Compressibility at the Wairakei–Tauhara geothermal field, New Zealand
Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, 2013Co-Authors: Michael Pender, Graham Ramsay, Trystan Glynn-morris, Bridget Y. Lynne, Chris J. BromleyAbstract:Geothermal fluid has been extracted from the Wairakei field in New Zealand since the mid-1950s for electricity generation. This has induced regional subsidence of more than 1 m; in addition, there are a few localised bowls with much greater subsidence. A comprehensive geotechnical investigation with recovery of undisturbed samples from depths of up to 774 m was undertaken with testing of samples from within and outside subsidence bowls to determine material properties, with the aim of improved understanding of subsidence within the Wairakei–Tauhara geothermal system. Results from more than 130 K0 triaxial compression tests on core samples are discussed. Given the volcanic origins of most of the material present, a wide variation in the measured constrained modulus values is not surprising. Scanning electron microscope images reveal differences between the texture of the soft materials and the very stiff materials; these correlate with the constrained modulus values. The applicability of the Terzaghi effec...
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Rock Compressibility at the wairakei tauhara geothermal field new zealand
Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, 2013Co-Authors: Michael Pender, Graham Ramsay, Bridget Y. Lynne, Trystan Glynnmorris, Chris J. BromleyAbstract:Geothermal fluid has been extracted from the Wairakei field in New Zealand since the mid-1950s for electricity generation. This has induced regional subsidence of more than 1 m; in addition, there are a few localised bowls with much greater subsidence. A comprehensive geotechnical investigation with recovery of undisturbed samples from depths of up to 774 m was undertaken with testing of samples from within and outside subsidence bowls to determine material properties, with the aim of improved understanding of subsidence within the Wairakei–Tauhara geothermal system. Results from more than 130 K0 triaxial compression tests on core samples are discussed. Given the volcanic origins of most of the material present, a wide variation in the measured constrained modulus values is not surprising. Scanning electron microscope images reveal differences between the texture of the soft materials and the very stiff materials; these correlate with the constrained modulus values. The applicability of the Terzaghi effec...
Michael Pender - One of the best experts on this subject based on the ideXlab platform.
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Rock Compressibility at the Wairakei–Tauhara geothermal field, New Zealand
Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, 2013Co-Authors: Michael Pender, Graham Ramsay, Trystan Glynn-morris, Bridget Y. Lynne, Chris J. BromleyAbstract:Geothermal fluid has been extracted from the Wairakei field in New Zealand since the mid-1950s for electricity generation. This has induced regional subsidence of more than 1 m; in addition, there are a few localised bowls with much greater subsidence. A comprehensive geotechnical investigation with recovery of undisturbed samples from depths of up to 774 m was undertaken with testing of samples from within and outside subsidence bowls to determine material properties, with the aim of improved understanding of subsidence within the Wairakei–Tauhara geothermal system. Results from more than 130 K0 triaxial compression tests on core samples are discussed. Given the volcanic origins of most of the material present, a wide variation in the measured constrained modulus values is not surprising. Scanning electron microscope images reveal differences between the texture of the soft materials and the very stiff materials; these correlate with the constrained modulus values. The applicability of the Terzaghi effec...
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Rock Compressibility at the wairakei tauhara geothermal field new zealand
Proceedings of the Institution of Civil Engineers - Geotechnical Engineering, 2013Co-Authors: Michael Pender, Graham Ramsay, Bridget Y. Lynne, Trystan Glynnmorris, Chris J. BromleyAbstract:Geothermal fluid has been extracted from the Wairakei field in New Zealand since the mid-1950s for electricity generation. This has induced regional subsidence of more than 1 m; in addition, there are a few localised bowls with much greater subsidence. A comprehensive geotechnical investigation with recovery of undisturbed samples from depths of up to 774 m was undertaken with testing of samples from within and outside subsidence bowls to determine material properties, with the aim of improved understanding of subsidence within the Wairakei–Tauhara geothermal system. Results from more than 130 K0 triaxial compression tests on core samples are discussed. Given the volcanic origins of most of the material present, a wide variation in the measured constrained modulus values is not surprising. Scanning electron microscope images reveal differences between the texture of the soft materials and the very stiff materials; these correlate with the constrained modulus values. The applicability of the Terzaghi effec...
Emad Shariff - One of the best experts on this subject based on the ideXlab platform.
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integrated investigation of dynamic drainage volume and inflow performance relationship transient ipr to optimize multistage fractured horizontal wells in tight shale formations
Journal of Energy Resources Technology-transactions of The Asme, 2016Co-Authors: Bin Yuan, Rouzbeh Ghanbarnezhad Moghanloo, Emad ShariffAbstract:This study presents an integrated approach to evaluate the efficiency of fracturing stimulation and predict well production performance. As the pressure disturbance propagates throughout the reservoir during long-time transient flow regimes, it will shape an expanding drainage volume. A macroscopic “compressible tank model (CTM)” using weak (integral) form of mass balance equation is derived to relate dynamic drainage volume (DDV) and average reservoir pressure to production history in extremely shale reservoirs. Fluids and Rock Compressibility, desorption parameters (for shale or coal gas), and production rates control the speed at which the boundaries advance. After the changes of average reservoir pressure within the expanding drainage volume are obtained, a new empirical inflow performance relationship (transient IPR) correlation is proposed to describe well performance during long transient flow periods in shale reservoirs. This new empirical correlation shows better match performance with field data than that of conventional Vogel-type IPR curves. The integrated approach of both CTM model and transient IPR correlation is used to determine and predict the optimal fracturing spacing and the size of horizontal section for few wells from one of shale oil plays in U.S. The results suggest the existence of optimal fracture spacing and horizontal well length for multistage fractured horizontal wells in shale oil reservoirs. In practice, this paper not only provides an insight in understanding the long transient flow production characteristics of shale reservoirs using concept of expanding drainage volume. Neither methods require comprehensive inputs for the strong form (differential) nor any prior knowledge about the sophisticated shale reservoir features (shape, size, etc.), the ultimate drainage volume, the ultimate recovery, optimal fracture spacing, and the length of horizontal section for each well can also be easily obtained by this new integrated analytical method.
P.m. Dranchuk - One of the best experts on this subject based on the ideXlab platform.
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Non-Darcy Transient Radial Gas Flow Through Porous Media
Annual Technical Meeting, 2013Co-Authors: J. Flores, P.m. DranchukAbstract:Canadian researchers at the Univ. of Alberta and the Univ. of Calgary have developed a computer program to solve the nonlinear partial differential equations describing transient radial gas flow through porous media. Specifically, the program can handle 4 sets of boundary conditions encountered in a finite radial system. The program has been employed to obtain pressure distributions and mass fluxes as functions of time and position for the constant-terminal rate case and the constant-terminal pressure case, in porous media having different values of permeability, inertial-resistance coefficient, slip coefficient, and Rock Compressibility. Changes of gas properties with pressure were taken into account. Results indicate that each of these Rock properties can, under certain conditions, appreciably affect the transient response. For instance, it was observed that slip, rather than being a laboratory curiosity, can affect the transient response in a typical tight reservoir.
