声发射
地质学
煤层气
水力压裂
断裂(地质)
煤
磁导率
粉碎
石油工程
超临界流体
天然气
压裂液
注水(采油)
压力(语言学)
岩土工程
煤矿开采
材料科学
复合材料
工程类
冶金
膜
生物
遗传学
有机化学
化学
废物管理
哲学
语言学
作者
Yulong Jiang,Weiguo Liang,Tingting Cai,Xiaoqiang Zhang,Jianbing Yan,Shaofei Yue
标识
DOI:10.1016/j.petrol.2022.111228
摘要
Parameters optimization during fracturing to form fracture networks is important to improve the permeability of reservoirs. In this paper, fracture growth in natural coal-rock blocks under different stresses with different fracturing medium and injection rates was studied, and the injection pressure evolution and acoustic emission dynamic response were further analyzed. The results indicate that the stress state, fracturing medium and injection flow rate significantly affected the fracture propagation behavior. When the stress difference was greater than or equal to 7 MPa (Δσ≥7MPa), the fracture could penetrate the coal-rock interface. In the same stress state (σv=12MPa,σH=8MPa,σv=5MPa), the fracture geometry and injection pressure evolution significantly differed when using different fracturing media (SC–CO2 and H2O). When supercritical CO2 (SC–CO2) was used as the fracturing medium, secondary fractures were created with small residual fracture widths. When H2O fracturing was adopted, single and straight fractures were obtained with a large residual fracture width, penetrating the coal-rock interface straightly. There existed significant differences in the critical stress difference, injection pressure evolution and the acoustic emission dynamic response between natural and artificial coal-rock block fracture during interface penetration. The results could provide important references for fracturing parameter optimization in the efficient exploitation of coalbed methane.
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