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Edition and Publication:
< Natural Gas and Oil > Editorial Department
Hosted by:
China Petroleum Engineering & Construction Corporation Southwest Company
Authorized by:
China Petroleum Engineering & Construction Corporation
Co-hosted by:
Overseas Research Center of Research Institute of Petroleum Exploration and Development
Editor in Chief:
Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
Address:
No.6, Shenghua Road, High-tech District, Chengdu, Sichuan, China
Postal Code:
610041
Tel:
028-86014709
028-86014500
Email:
cnpc-ngo@cnpc.com.cn
Issue:ISSN 1006-5539
CN 51-1183/TE

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Numerical Simulation of Shale Gas Reservoir Considering Startup Pressure Gradient

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Key Words： Shale gas； Start-up pressure gradient； Double pore medium； Numerical simulation； Well bottom pressure

Abstract：Shale gas is a very important unconventional energy and its seepage principle and development have obtained more and more attention. Established is a mathematical model for double porosity medium shale gas reservoir according to shale gas seepage mechanism， gas adsorption and desorption characteristics，seepage theory and principle of conservation of mass. Based on start-up pressure gradient and isothermal adsorption principles， finite difference method is applied to obtain a numerical model. Prepared is a corresponding program to solve the numerical model. Analyzed are effects of the start-up pressure gradient， geometrical factors， reserve/volume ratio， Langmuir pressure and Langmuir volume on bottom hole pressure changes. The results show that the dual medium model can accurately describe the desorption process of the adsorbed gas in reservoir stratum， fluid channeling process between matrix system and crack system. Formation parameters analysis and indoor experiments can be used to obtain indirectly Langmuir pressure and Langmuir volume in shale gas reservoir desorption process， which is very important to bottom hole pressure analysis and productivity prediction.