Experimental study of permeability change of organic-rich gas shales under high effective stress

doi:10.1016/j.jngse.2019.01.014

CORC > 武汉岩土力学研究所 > 中科院武汉岩土力学所 > 岩土力学所知识全产出 > 期刊论文

	Experimental study of permeability change of organic-rich gas shales under high effective stress
	Chen, Tianyu ; Feng, Xia-Ting ; Cui, Guanglei ; Tan, Yuling ; Pan, Zhejun
刊名	JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
	2019
卷号	64 期号:-页码:43844
关键词	Gas shale Shale gas High stress Permeability Fracture
ISSN号	1875-5100
DOI	10.1016/j.jngse.2019.01.014
英文摘要	Shale permeability and its variation under high stress are vital for gas production from deep shale gas reservoirs. Most experiments of stress-dependent permeability for organic-rich shale were conducted under lower stress less than 40 MPa, therefore, shale permeability evolution under high stress is not clear. In this work, the effects of high stress on the permeability and fracture compressibility of shales were investigated experimentally. Moreover, the impact of stress cycling on permeability were also studied. Four shale samples including two intact samples and two fractured samples from Cambrian Niutitang Shale formation and Silurian Longmaxi Shale formation were used. Permeability was measured using Helium under different stress conditions, including different confining pressure, different gas pressure, and constant effective stress. The highest effective stress and gas pressure in this work was 59.5 MPa and 10 MPa, respectively. Fracture compressibilities were calculated using the stress-dependent permeability data. The results show that the permeability of the intact samples and fractured samples decreased by one order of magnitude and three orders of magnitude, respectively, with the effective stress changing from 1.5 MPa to 59.5 MPa. The shale permeability results show a two-stage characteristic and nonlinearly decreasing trend with the increase of effective stress, demonstrating that the fracture compressibility is stress dependent and decreases with stress. The permeability hysteresis occurs between the loading and unloading cycles due to the inelastic compression of the pore. The modelling results also show that the Klinkenberg constant show a positive correlation with effective stress, as effective stress reduces the fracture opening and absolute permeability.
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
WOS记录号	WOS:000460316000001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/15017]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.Northeastern Univ, Minist Educ Safe Min Deep Met Mines, Key Lab, Shenyang 110004, Liaoning, Peoples R China; 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China; 3.CSIRO Energy Business Unit, Private Bag 10, Clayton, Vic 3169, Australia
推荐引用方式 GB/T 7714	Chen, Tianyu,Feng, Xia-Ting,Cui, Guanglei,et al. Experimental study of permeability change of organic-rich gas shales under high effective stress[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2019,64(-):43844.
APA	Chen, Tianyu,Feng, Xia-Ting,Cui, Guanglei,Tan, Yuling,&Pan, Zhejun.(2019).Experimental study of permeability change of organic-rich gas shales under high effective stress.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,64(-),43844.
MLA	Chen, Tianyu,et al."Experimental study of permeability change of organic-rich gas shales under high effective stress".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 64.-(2019):43844.