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《Fault-Block Oil & Gas Field》 2018-03
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Pore compression coefficient considering granular deformation and inter-granular deformation

MAO Xiaolong;LIU Yuetian;GUAN Wenlong;LIU Siping;LI Jun;State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum;Research Institute of Petroleum Exploration & Development,PetroChina;  
At present, there are many controversies about the study of pore compression coefficient, the basic physical parameter of rock in reservoir engineering research. The essential issue of these arguments is that the stress-strain relationship among total volume, particle volume, and pore volume of porous medium is not clear, which needs to be clarified. Based on deep analysis of the classical effective stress principles of Terzaghi and Skempton, the relationship between three types of volumes of porous media and the fluid pressure change was systematically deduced by two methods considering both granular deformation and inter-granular deformation, a new relation formula of pore compression coefficient was established, and regular analysis and case verification was carried out. The results indicate that pore volume deformation is related to both granular deformation and inter-granular deformation,and inter-granular deformation of most rocks is much larger than granular deformation; pore compression coefficient is much larger than total volume compression coefficient, which is larger than particle volume compression coefficient; the "high compression with high porosity" logic applies to total volume compression coefficient, while porosity compression coefficient is negatively correlated with porosity since pore volume itself is the denominator; the new relational formula is consistent with experimental test results and Hall curve chart.
【Fund】: 国家自然科学基金项目“各向异性裂缝页岩气藏渗流机理与理论研究”(51374222);; 国家重点基础研究发展计划(973计划)项目“陆相致密油高效开发基础研究”(2015CB250905);; 国家科技重大专项专题“中东典型碳酸盐岩油藏改善水驱开发效果关键技术研究”(2017ZX05032-004-002);; 中国石油重大科技专项课题“火山岩油藏效益开发关键技术研究与应用”(2017E-0405)
【CateGory Index】: TE31
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