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Permeability evolution in tectonic coal: The roles of moisture and pressurized water-injection
Greenhouse Gases: Science and Technology ( IF 2.2 ) Pub Date : 2021-04-06 , DOI: 10.1002/ghg.2069
Kang Yanfei 1, 2 , Fan Jinyang 1, 2 , Liu Peng 1 , Du Junsheng 1 , Jiang Deyi 1, 3
Affiliation  

Water often influences the exploitation of Coalbed methane (CBM) as well as the hydraulically enhanced permeability; it is therefore useful to objectively quantify the permeation properties of a CBM reservoir with different moisture contents. Based on the occurrence of CBM and the laws governing gas flow in CBM reservoirs, gas seepage experiments were carried out on the coal collected from the Baijiao mine in Sichuan, China. Various moisture contents were evaluated using natural coal samples, dry coal samples heated in an oven for various periods, and coal samples wet by soaking them in different pressure water under a constant effective confining stress. Results showed that: (1) The coal moisture decreased gradually with the drying time and increased with the soaking time. When coal is soaked in high pressure water (5–20 MPa), the moisture content in coal will increase from 2.60 to 3.85% with the increasing of water pressure. (2) The permeability of soaked coal decreased with the increasing of gas pressure, while the permeability of natural coal firstly decreased and then increased with the pore pressure decrease. (3) For the coal with higher moisture contents, gas permeability is more sensitive to the reduction of pore pressure, which may be due to the alteration of fracture structure induced by high-pressure water injection. (4) Moisture content of coal affects the slippage effect in coal pores, and a higher moisture in coal will result in the decrease effective pore throat, incurring a stronger slippage flow and a higher apparent permeability of coal. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译:

构造煤渗透率演化:水分和加压注水的作用

水通常会影响煤层气 (CBM) 的开采以及水力增强渗透率;因此,客观地量化具有不同含水量的煤层气储层的渗透特性是有用的。根据煤层气的赋存情况和煤层气储层气体流动规律,对四川白胶矿采煤进行了气体渗流实验。使用天然煤样、在烘箱中加热不同时间的干煤样以及在恒定有效围压下通过在不同压力水中浸泡湿煤样来评估各种水分含量。结果表明:(1)煤的水分随干燥时间的延长逐渐降低,随浸泡时间的延长而增加。当煤在高压水(5-20​​兆帕)中浸泡时,随着水压的增加,煤中的水分含量将从2.60%增加到3.85%。(2) 浸透煤的渗透率随着瓦斯压力的增加而减小,而天然煤的渗透率随着孔隙压力的减小先减小后增大。(3) 对于含水率较高的煤,气体渗透率对孔隙压力的降​​低更为敏感,这可能是由于高压注水引起的裂缝结构改变所致。(4) 煤的含水量影响煤孔隙中的滑移效果,煤中含水量越高,有效孔喉越小,滑移流越强,煤的表观渗透率越高。© 2021 化学工业协会和 John Wiley & Sons, Ltd. 85%随着水压的增加。(2) 浸透煤的渗透率随着瓦斯压力的增加而减小,而天然煤的渗透率随着孔隙压力的减小先减小后增大。(3) 对于含水率较高的煤,气体渗透率对孔隙压力的降​​低更为敏感,这可能是由于高压注水引起的裂缝结构改变所致。(4) 煤的含水量影响煤孔隙中的滑移效果,煤中含水量越高,有效孔喉越小,滑移流越强,煤的表观渗透率越高。© 2021 化学工业协会和 John Wiley & Sons, Ltd. 85%随着水压的增加。(2) 浸透煤的渗透率随着瓦斯压力的增加而减小,而天然煤的渗透率随着孔隙压力的减小先减小后增大。(3) 对于含水率较高的煤,气体渗透率对孔隙压力的降​​低更为敏感,这可能是由于高压注水引起的裂缝结构改变所致。(4) 煤的含水量影响煤孔隙中的滑移效果,煤中含水量越高,有效孔喉越小,滑移流越强,煤的表观渗透率越高。© 2021 化学工业协会和 John Wiley & Sons, Ltd. (2) 浸透煤的渗透率随着瓦斯压力的增加而减小,而天然煤的渗透率随着孔隙压力的减小先减小后增大。(3) 对于含水率较高的煤,气体渗透率对孔隙压力的降​​低更为敏感,这可能是由于高压注水引起的裂缝结构改变所致。(4) 煤的含水量影响煤孔隙中的滑移效果,煤中含水量越高,有效孔喉越小,滑移流越强,煤的表观渗透率越高。© 2021 化学工业协会和 John Wiley & Sons, Ltd. (2) 浸透煤的渗透率随着瓦斯压力的增加而减小,而天然煤的渗透率随着孔隙压力的减小先减小后增大。(3) 对于含水率较高的煤,气体渗透率对孔隙压力的降​​低更为敏感,这可能是由于高压注水引起的裂缝结构改变所致。(4) 煤的含水量影响煤孔隙中的滑移效果,煤中含水量越高,有效孔喉越小,滑移流越强,煤的表观渗透率越高。© 2021 化学工业协会和 John Wiley & Sons, Ltd. (3) 对于含水率较高的煤,气体渗透率对孔隙压力的降​​低更为敏感,这可能是由于高压注水引起的裂缝结构改变所致。(4) 煤的含水量影响煤孔隙中的滑移效果,煤中含水量越高,有效孔喉越小,滑移流越强,煤的表观渗透率越高。© 2021 化学工业协会和 John Wiley & Sons, Ltd. (3) 对于含水率较高的煤,气体渗透率对孔隙压力的降​​低更为敏感,这可能是由于高压注水引起的裂缝结构改变所致。(4) 煤的含水量影响煤孔隙中的滑移效果,煤中含水量越高,有效孔喉越小,滑移流越强,煤的表观渗透率越高。© 2021 化学工业协会和 John Wiley & Sons, Ltd. 导致更强的滑移流和更高的煤的表观渗透率。© 2021 化学工业协会和 John Wiley & Sons, Ltd. 导致更强的滑移流和更高的煤的表观渗透率。© 2021 化学工业协会和 John Wiley & Sons, Ltd.
更新日期:2021-04-06
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