煤矿井下水力压裂裂缝扩展分析

Analysis of Hydraulic Fracturing Crack Growth in Underground Coal Mine

水力压裂作为一种改造储层渗透性工艺,通过向储层注入高压液体,在储层中形成一定规模的裂缝,通过沟通储层内部裂隙,提高储层渗透性。然而水力压裂中裂缝的劈开和延伸方向受到多方面的影响,储层所受到应力大小和方向、储层的地质构造、力学性质及其中的原始裂隙发育情况等都不同程度地影响裂缝的开启与扩展。通过对前人工作进行总结、分析,找到影响裂缝扩展的主要因素,为压裂钻孔的布置提供指导。

Hydraulic fracturing is a kind of technology of reservoir permeability, which can form a certain scale of fracture in reservoir, and increase the permeability of reservoir by communicating with the reservoir. However, the opening and expanding direction of fracture in hydraulic fracturing is affected by many factors, the size and direction of ground stress, the structure and mechanical properties of the target reservoir, and the development degree of the natural fractures are affected by the opening and expansion of the cracks. Summarize and analyze the previous work, find the main factors that affect the crack growth, and provide guidance for the layout of the fracturing.