Effects of microfractures properties on stress-dependent permeability in tight oil reservoirs

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	Effects of microfractures properties on stress-dependent permeability in tight oil reservoirs
	Yang L(杨柳)1; Lu XB(鲁晓兵)1 ; Shi X 2; Zhang KH 2; Gao J 3; Chen X 3; Zhang ZB 3
会议录名称	52nd U.S. Rock Mechanics/Geomechanics Symposium
	2018
会议名称	52nd U.S. Rock Mechanics/Geomechanics Symposium
会议日期	June 17, 2018 - June 20, 2018
会议地点	Seattle, WA, United states
摘要	Several laboratory experiments are carried out to investigate the effects of microfractures on stress-dependent permeability. An analytical model depending on pore elasticity theory is proposed to study the related influencing factors. The results show that each curve of stress-dependent permeability is divided into two regions: Microfractures closure region and pore compress region. The permeability decreases significantly in microfractures closure region, but it does not change too much in pore compress region. The permeability decreases by about 85~90% in total. It suggests that microfractures deformation cannot recover easily. The analytical solution results present that the volume fraction of microfractures has an important effect on stress-dependent permeability. The stress sensitive coefficient significantly decreases with the ratio of pores volume to microfractures volume (PV/FV). When the value of PV/FV is larger than 2, the stress sensitive coefficient does not change obviously with PV/FV. The high microfractures compressibility is the primary reason why the permeability in tight sandstone presents more sensitivity to effective stress. Copyright © 2018 ARMA, American Rock Mechanics Association.
关键词	Petroleum reservoirs Road construction Rock mechanics Effective stress Elasticity theory Laboratory experiments Microfractures Oil reservoirs Stress sensitive coefficient Stress dependent Tight sandstones
收录类别	EI
语种	英语
文献类型	会议论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/78005
专题	流固耦合系统力学重点实验室
作者单位	1.Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China; 2.China University of Petroleum (East China), Qingdao, China; 3.Research Institute of Petroleum Exploration and Development, Beijing, China
推荐引用方式 GB/T 7714	Yang L,Lu XB,Shi X,et al. Effects of microfractures properties on stress-dependent permeability in tight oil reservoirs[C]52nd U.S. Rock Mechanics/Geomechanics Symposium,2018.

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