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A Study of Nonlinear Elasticity Effects on Permeability of Stress Sensitive Shale Rocks Using an Improved Coupled Flow and Geomechanics Model: A Case Study of the Longmaxi Shale in China

Author

Listed:
  • Chenji Wei

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China)

  • Liangang Wang

    (PetroChina Exploration & Production Company, Beijing 100032, China)

  • Baozhu Li

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China)

  • Lihui Xiong

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China)

  • Shuangshuang Liu

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China)

  • Jie Zheng

    (Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China)

  • Suming Hu

    (Natural Gas Division, Tarim Oilfield Company, CNPC, Xinjiang 841000, China)

  • Hongqing Song

    (School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China)

Abstract

Gas transport in shale gas reservoirs is largely affected by rock properties such as permeability. These properties are often sensitive to the in-situ stress state changes. Accurate modeling of shale gas transport in shale reservoir rocks considering the stress sensitive effects on rock petrophysical properties is important for successful shale gas extraction. Nonlinear elasticity in stress sensitive reservoir rocks depicts the nonlinear stress-strain relationship, yet it is not thoroughly studied in previous reservoir modeling works. In this study, an improved coupled flow and geomechanics model that considers nonlinear elasticity is proposed. The model is based on finite element methods, and the nonlinear elasticity in the model is validated with experimental data on shale samples selected from the Longmaxi Formation in Sichuan Basin China. Numerical results indicate that, in stress sensitive shale rocks, nonlinear elasticity affects shale permeability, shale porosity, and distributions of effective stress and pore pressure. Elastic modulus change is dependent on not only in-situ stress state but also stress history path. Without considering nonlinear elasticity, the modeling of shale rock permeability in Longmaxi Formation can overestimate permeability values by 1.6 to 53 times.

Suggested Citation

  • Chenji Wei & Liangang Wang & Baozhu Li & Lihui Xiong & Shuangshuang Liu & Jie Zheng & Suming Hu & Hongqing Song, 2018. "A Study of Nonlinear Elasticity Effects on Permeability of Stress Sensitive Shale Rocks Using an Improved Coupled Flow and Geomechanics Model: A Case Study of the Longmaxi Shale in China," Energies, MDPI, vol. 11(2), pages 1-16, February.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:2:p:329-:d:129933
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    References listed on IDEAS

    as
    1. Ting Huang & Zhengwu Tao & Erpeng Li & Qiqi Lyu & Xiao Guo, 2017. "Effect of Permeability Anisotropy on the Production of Multi-Scale Shale Gas Reservoirs," Energies, MDPI, vol. 10(10), pages 1-23, October.
    2. Yusong Wu & Xiao Li & Jianming He & Bo Zheng, 2016. "Mechanical Properties of Longmaxi Black Organic-Rich Shale Samples from South China under Uniaxial and Triaxial Compression States," Energies, MDPI, vol. 9(12), pages 1-24, December.
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