Reassessment of coal permeability evolution using steady-state flow methods: The role of flow regime transition

doi:10.1016/j.coal.2019.103210

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	Reassessment of coal permeability evolution using steady-state flow methods: The role of flow regime transition
	Wang, Linsen ; Chen, Zhongwei ; Wang, Chunguang ; Elsworth, Derek ; Liu, Weitao
	2019
发表期刊	INTERNATIONAL JOURNAL OF COAL GEOLOGY
ISSN	0166-5162
卷号	211 期号:-页码:-
摘要	Steady-state flow methods are widely applied in the laboratory where permeability evolution is typically evaluated assuming a uniform pressure gradient along the sample. The accuracy of this approach is questionable for tight geomaterials when gas is used as the injecting fluid, due to: (i) the nonlinear distribution of pore pressure and gradient along the sample, suggesting that (ii) both slip and viscous flow may occur concurrently within samples containing nano-pores. The following presents laboratory permeability measurements integrated with numerical analysis to investigate the evolution of coal permeability under different flow regimes. Measured coal permeability first decreases and then rebounds as gas injection pressure is reduced, indicating the transition in flow regime from viscous to slip dominant. Numerical results chart the nonlinear distribution of pore pressure along the sample and the spatial transition of flow regimes determined by controlling the magnitude of the injection pressure. When injection pressure is below the threshold for slip flow, then slip flow dominates throughout the entire coal sample and apparent permeability increases significantly along the gas flow direction. The relative contribution of the slip flow to total flow increases with the reduction in pore pressure, increasing from 0.02 to 0.18 for the tested sample. Results also show that the conventional method of plotting apparent permeability against the mean experimental pressure always gives a greater permeability than the two alternate methods proposed in this work, and the discrepancy increases with increasing injection pressures (up to 7.66% when pore pressure = 6 MPa). Uncertainty analysis is strongly recommended when measuring permeability of tight rocks using this experimental method.
关键词	Slip flow Apparent permeability Effective stress Knudsen number
DOI	10.1016/j.coal.2019.103210
收录类别	SCI
语种	英语
WOS研究方向	Energy & Fuels ; Geology
WOS类目	Energy & Fuels ; Geosciences, Multidisciplinary
WOS记录号	WOS:000478711100001
引用统计	被引频次：66[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.198/handle/2S6PX9GI/14947
专题	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
作者单位	1.Shandong Univ Sci & Technol, State Key Lab Min Disaster Prevent & Control Cofo, Qingdao, Shandong, Peoples R China; 2.Shandong Univ Sci & Technol, Minist Sci & Technol, Qingdao, Shandong, Peoples R China; 3.Univ Queensland, Sch Mech & Min Engn, St Lucia, Qld 4074, Australia; 4.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Wang, Linsen,Chen, Zhongwei,Wang, Chunguang,et al. Reassessment of coal permeability evolution using steady-state flow methods: The role of flow regime transition[J]. INTERNATIONAL JOURNAL OF COAL GEOLOGY,2019,211(-):-.
APA	Wang, Linsen,Chen, Zhongwei,Wang, Chunguang,Elsworth, Derek,&Liu, Weitao.(2019).Reassessment of coal permeability evolution using steady-state flow methods: The role of flow regime transition.INTERNATIONAL JOURNAL OF COAL GEOLOGY,211(-),-.
MLA	Wang, Linsen,et al."Reassessment of coal permeability evolution using steady-state flow methods: The role of flow regime transition".INTERNATIONAL JOURNAL OF COAL GEOLOGY 211.-(2019):-.

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