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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 X2; Zhang KH2; Gao J3; Chen X3; Zhang ZB3
Source Publication52nd U.S. Rock Mechanics/Geomechanics Symposium
Conference Name52nd U.S. Rock Mechanics/Geomechanics Symposium
Conference DateJune 17, 2018 - June 20, 2018
Conference PlaceSeattle, WA, United states
AbstractSeveral 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.
KeywordPetroleum reservoirs Road construction Rock mechanics Effective stress Elasticity theory Laboratory experiments Microfractures Oil reservoirs Stress sensitive coefficient Stress dependent Tight sandstones
Indexed ByEI
Document Type会议论文
Affiliation1.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
Recommended Citation
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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