岩土力学2025，Vol.46Issue(5)：1466-1476,1488,12.DOI:10.16285/j.rsm.2024.1008
基于等效裂隙的表观渗透率模型改进及变滑脱效应研究
Improved apparent permeability model based on equivalent fractures and variable slip effects analysis
摘要
Abstract
The slip effect can significantly enhance the permeability of fractured rock,and understanding its influence is crucial for comprehending gas flow dynamics within reservoirs.Most existing theoretical models treat intrinsic permeability and slip coefficient as constants and lack a method to define the critical pore pressure where the slip effect becomes significant.Thus,a dynamic apparent permeability model was developed based on equivalent fracture and rock bridge models,considering slip coefficient and intrinsic permeability as functions of effective stress and adsorption swelling.Using the established dynamic apparent permeability model,we analyzed variations in intrinsic permeability and slip coefficient under different confining stresses and permeable media.Additionally,we introduced the concept of the slip effect contribution rate to identify the critical pore pressure where the slip effect becomes significant.The results indicate that:1)Intrinsic permeability increases with rising pore pressure,while slip coefficients decrease;2)For different permeable media,the increase in intrinsic permeability with pore pressure is linked to gas adsorption properties,and slip coefficient variation is more complex;3)A power function relationship exists between the slip effect contribution rate and pore pressure,with the critical pore pressure order being N2＜CO2＜He.This study offers theoretical guidance for predicting permeability and extracting resources from fractured rocks.关键词
滑脱效应/围压/渗透介质/临界压力/渗透率Key words
slip effect/confining stress/permeable media/critical pressure/permeability分类
建筑与水利引用本文复制引用
肖智勇,王刚,刘杰,邓华锋,郑程程,姜枫..基于等效裂隙的表观渗透率模型改进及变滑脱效应研究[J].岩土力学,2025,46(5):1466-1476,1488,12.基金项目
国家自然科学基金资助项目(No.52079077) （No.52079077）
湖北省自然科学基金(No.2025AFB358).This work was supported by the National Natural Science Foundation of China(52079077)and the Natural Science Foundation of Hubei Province(2025AFB358). （No.2025AFB358）
