定向水力压裂切顶卸压参数模拟研究

Study on Simulation of Top Cutting and Pressure Relief Parameters in Directional Fracking

为了解决坚硬顶板难垮难落的问题,利用数值模拟软件对水力压裂进行研究。当压裂液沿着预制裂缝注入后,裂缝内部压裂液聚集。当预制裂缝内部的压裂液聚集能量超过岩石的抗剪强度时,裂缝会发生起裂、扩展。对不同注液排量、水平应力差和弹性模量下的起裂效果进行分析,为后续坚硬顶板的切顶卸压提供一定的应用方案。

In order to solve the problem that hard roof is difficult to collapse and fall,this paper uses numerical simulation software to study fracking.When the fracturing fluid is injected along the prefabricated fracture,the fracturing fluid in the fracture gathers.When the accumulated energy of the fracturing fluid in the prefabricated fracture exceeds the shear strength of rock,the fracture starts and expands.The cracking effects under different injection displacement,horizontal stress difference,and elastic modulus are analyzed,providing a certain application plan for the subsequent top cutting and pressure relief of hard roof.