Fracture and pore structure dynamic evolution of coals during hydraulic fracturing

被引：0
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作者：
Lu, Yiyu [1 ,2 ]
Wang, Li [1 ,2 ]
Ge, Zhaolong [1 ,2 ]
Zhou, Zhe [3 ]
Deng, Kai [1 ,2 ]
Zuo, Shaojie [1 ,2 ]
机构：
[1] State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing,400044, China
[2] National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing,400044, China
[3] Postdoctoral Station of Safety Science and Engineering, Chongqing University, Chongqing,400044, China
来源：
Fuel | 2020年 / 259卷
关键词：
Pore structure;
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摘要：
Hydraulic fracturing is an effective method for producing coalbed methane. To better understand the evolution of the fracture and pore structure of coals that contain macro-fractures during hydraulic fracturing, we have performed a series of in-situ compression experiments under continuous injection liquid conditions and dynamically monitored the samples using nuclear magnetic resonance methods. The mechanism of fracture and pore structure dynamic evolution is identified in terms of spherical expansion theory. The total porosity increases dramatically within 10–120 min of the initial injection stage, and pore channels form. The number of micro-pores ( © 2019 Elsevier Ltd
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