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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
2019
Source PublicationJOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
ISSN1875-5100
Volume64Issue:-Pages:43844
AbstractShale 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.
KeywordGas shale Shale gas High stress Permeability Fracture
DOI10.1016/j.jngse.2019.01.014
Indexed BySCI
Language英语
WOS Research AreaEnergy & Fuels ; Engineering
WOS SubjectEnergy & Fuels ; Engineering, Chemical
WOS IDWOS:000460316000001
Citation statistics
Cited Times:34[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://119.78.100.198/handle/2S6PX9GI/15017
Collection岩土力学所知识全产出_期刊论文
国家重点实验室知识产出_期刊论文
Affiliation1.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
Recommended Citation
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.
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