Benchmark assessment of coal permeability models on the accuracy of permeability prediction

doi:10.1016/j.fuel.2014.04.078

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

	Benchmark assessment of coal permeability models on the accuracy of permeability prediction
	Peng, Yan 1,2; Liu, Jishan 2; Zhu, Wancheng 3; Pan, Zhejun 4; Connell, Luke 4
刊名	FUEL
	2014
卷号	132 页码:194-203
关键词	Benchmark assessment Coal permeability Boundary effects Local equilibrium
ISSN号	0016-2361
DOI	10.1016/j.fuel.2014.04.078
英文摘要	When natural gas is extracted from coal seams, complex interactions of stress and sorptive chemistry have a strong influence on the properties of coal. These include influences on gas sorption and flow, coal deformation, porosity change and permeability modification. In this study, we define this chain of reactions as "coupled processes'' implying that one physical process affects the initiation and progress of another. The individual process, in the absence of full consideration of cross couplings, forms the basis of the conventional coal seam gas reservoir engineering. Therefore, the inclusion of cross couplings is the key to rigorously formulate the unconventional coal seam gas reservoir engineering. Among those cross-couplings, the coal permeability model is the most important one. A variety of permeability models were developed to define how the coal permeability evolves during gas production. These models were derived normally under three common assumptions: (1) uniaxial strain; (2) constant overburden stress; and (3) local equilibrium. Under these assumptions, coal permeability can be defined as a function of gas pressure only. Our comprehensive review concluded that these models have so far failed to explain experimental results from conditions of the controlled stresses, and only partially succeeded in explaining in situ data. We identified the adoption of these three assumptions as the fundamental reason for failures. In this study, we relaxed the first two assumptions and derived a coal permeability model under variable stress conditions. Furthermore, we considered the effective stress transfer between matrix and fracture and transformed this stress transfer into the modification of fracture aperture. This relaxes the third common assumption, i.e., local equilibrium condition. We applied this approach to generate a series of permeability type curves under the full spectrum of boundary conditions spanning prescribed stresses through constrained displacement. We benchmarked the solutions generated by using the permeability models with three common assumptions against our "accurate'' solutions by using permeability models without these assumptions for the full spectrum of boundary conditions, and concluded that these common assumptions could produce unacceptable errors. (C) 2014 Elsevier Ltd. All rights reserved.
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000336669500026
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/3630]
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.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn ; 2.Univ Western Australia, Sch Mech & Chem Engn; 3.Northeastern Univ, Key Lab Minist Educ Safe Min Deep Met Mines ; 4.CSIRO Earth Sci & Resource Engn
推荐引用方式 GB/T 7714	Peng, Yan,Liu, Jishan,Zhu, Wancheng,et al. Benchmark assessment of coal permeability models on the accuracy of permeability prediction[J]. FUEL,2014,132:194-203.
APA	Peng, Yan,Liu, Jishan,Zhu, Wancheng,Pan, Zhejun,&Connell, Luke.(2014).Benchmark assessment of coal permeability models on the accuracy of permeability prediction.FUEL,132,194-203.
MLA	Peng, Yan,et al."Benchmark assessment of coal permeability models on the accuracy of permeability prediction".FUEL 132(2014):194-203.