Numerical study on the influence of coal-roof interface on vertical propagation of hydraulic fracture

被引：1

作者：

Li, Haozhe ^{[1
]}

Zhang, Qun ^{[1
]}

Jiang, Zaibing ^{[1
]}

Xu, Yaobo ^{[1
]}

Liu, Jia ^{[1
]}

机构：

[1] China Coal Technol & Engn Grp Corp, Xian Res Inst, Xian 710077, Shanxi, Peoples R China

来源：

INTERNATIONAL JOURNAL OF OIL GAS AND COAL TECHNOLOGY | 2022年 / 29卷 / 03期

基金：

中国国家自然科学基金;

关键词：

coalbed methane; CBM; numerical simulation; cohesive zone method; CZM; fracture propagation; coal-roof interface; ROCK; SIMULATION; STRENGTH; BEHAVIOR; METHANE; GROWTH;

D O I：

10.1504/IJOGCT.2022.121053

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

To extract coalbed methane (CBM) from tectonically deformed coal seams, a horizontal well was drilled in the roof of coal seam. Staged hydraulic fracturing was then conducted to connect the horizontal wellbore and underlying coal seam. A finite element model that coupled seepage, stress, and damage theories was built to investigate the influence of coal-roof interface on vertical propagation of hydraulic fracture. Results showed that the coefficient of friction and crossing stress ratio were the two primary factors controlling the fracture penetration. A higher interfacial shear strength is beneficial to fracture penetration. The crossing stress ratio required for fracture penetration decreases as the interface friction coefficient increases. The numerical simulation results agree well with the field pilot test and can provide theoretical support for effective CBM development in similar coal seams. [Received: October 28, 2020; Accepted: March 10, 2021]

引用

页码：258 / 284

页数：27

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