Study on the anisotropic permeability in different rank coals under influences of supercritical CO2 adsorption and effective stress and its enlightenment for CO2 enhance coalbed methane recovery

doi:10.1016/j.fuel.2019.116515

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	Study on the anisotropic permeability in different rank coals under influences of supercritical CO2 adsorption and effective stress and its enlightenment for CO2 enhance coalbed methane recovery
	Niu, Qinghe 5,6; Cao, Liwen 1; Sang, Shuxun 1; Zhou, Xiaozhi 1; Wang, Wei 5,6; Yuan, Wei 5,6; Ji, Zhongmin 2; Wang, Haichao 3; Nie, Yan 4
	2020-02-15
关键词	Adsorption Anisotropy Carbon dioxide Coal Coal bed methane Coal deposits Firedamp Mechanical permeability Methane Petroleum reservoir engineering Silicon compoundsAnisotropic permeability Bedding planes Coalbed methane recovery Initial permeability Permeability damage Permeability loss Prefracturing Stress sensitivity
卷号	262
DOI	10.1016/j.fuel.2019.116515
英文摘要	The permeability of coal reservoir is dynamically changed during CO2 enhance coalbed methane recovery projects (CO2-ECBM) and is controlled by the two main influencing factors: effective stress and CO2 adsorption. Six coal core samples parallel and vertical bedding plane directions were drilled, which were then adopted to conduct the permeability tests under conditions of cyclic loading/unloading and supercritical CO2 saturation. Results show that the permeability is depended on the coal rank, the middle rank coal possesses the highest initial permeability because of its moderate compaction and largely generated cleats during the coalification. The permeability is anisotropic, manifesting in the permeability in parallel bedding plane direction is larger than that in the vertical bedding plane direction. The stress sensitivity coefficient and IPLRi in parallel bedding plane direction exceed that in vertical bedding plane direction, however, PALR exhibits the opposite law. Hereat, the fractures parallel to bedding plane are susceptible to the stress change and the cleats vertical to bedding plane are sensitive to the ScCO2 adsorption. In view of the irreversible permeability damage by the stress change and CO2 adsorption, experiments in this paper confirms that prefracturing can dramatically decrease the IPLRi, stress sensitivity coefficient and PALR of coal seams, which may be the potential and effective measure to enhence the injectivity of CO2 in coal seams. © 2019 Elsevier Ltd
会议录	Fuel
会议录出版者	Elsevier Ltd
语种	英语
ISSN号	00162361
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/132716]
专题	土木工程学院
作者单位	1.School of Resource and Earth Science, China University of Mining and Technology, Xuzhou; 221008, China; 2.School of Earth Science and Engineering, Hohai University, Nanjing; 211100, China; 3.Institute of Geology and Mining Engineering, Xinjiang University, Urumqi; Xinjiang; 830047, China; 4.School of Civil Engineering, Lanzhou University of Technology, Lanzhou; 730050, China 5.School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang; 050043, China; 6.Hebei Technology and Innovation Center on Safe and Efficient Mining of Metal Mines, Shijiazhuang; 050043, China;
推荐引用方式 GB/T 7714	Niu, Qinghe,Cao, Liwen,Sang, Shuxun,et al. Study on the anisotropic permeability in different rank coals under influences of supercritical CO2 adsorption and effective stress and its enlightenment for CO2 enhance coalbed methane recovery[C]. 见:.