Dual-Porosity Apparent Permeability Models of Unconventional Gas Migration Based on Biot's Porous Media

Bin Gu ¹Hongyuan Liu ²Yiuwing Mai ³Bing Wang⁴

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作者信息

1. School of Manufacturing Science and Engineering,Key Laboratory of Testing for Manufacturing Process,Ministry of Education,Southwest University of Science and Technology,Mianyang 621010,China;School of Aerospace,Mechanical and Mechatronic Engineering,The University of Sydney,Sydney,NSW 2006,Australia
2. School of Aerospace,Mechanical and Mechatronic Engineering,The University of Sydney,Sydney,NSW 2006,Australia
3. School of Aerospace,Mechanical and Mechatronic Engineering,The University of Sydney,Sydney,NSW 2006,Australia;Department of Mechanical Engineering,The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong,China
4. School of Manufacturing Science and Engineering,Key Laboratory of Testing for Manufacturing Process,Ministry of Education,Southwest University of Science and Technology,Mianyang 621010,China
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Abstract

Stress-dependent permeability models are developed for the organic pores and inorganic cleats/fractures in unconventional gas reservoirs,which are modeled as Biot's porous media of dual-porosity.Further considering multiple flow mechanisms such as dynamic effects of gas flow and surface diffusion,apparent permeability models are obtained to investigate the characteristics of unconventional gas migration.Compared to the gas transfer in single-porosity reservoirs,the gas migration ability of cleats in dual-porosity stratums rarely changes while that of organic pores is greatly improved because cleats sustain major geomechanical shrinkage deformation when the pore pressure drops.Further,the mass flux of reservoirs is dominated by the mass flux of cleats,which has a lower peak value,but a much longer production term than those in single-porosity reservoirs due to the interaction between organic pores and cleats.Parametric analysis is conducted to identify key factors significantly impacting mass flux in unconventional reservoirs.Reasons for the mass flux variation are also explored in terms of gas migration ability and pore pressure distribution.

Key words

Unconventional gas migration/Apparent permeability/Dual-porosity/Stress dependence/Multiple flow mechanisms

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基金项目

National Natural Science Foundation of China(12102372)

National Natural Science Foundation of China(11872324)

Open Research Fund of CNMGE Platform & NSCC-TJ(CNMGE2023011)

出版年

2024

固体力学学报(英文版)

中国力学学会

固体力学学报(英文版)

影响因子：0.214

ISSN：0894-9166

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