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为研究水力压裂时地应力对破裂压力和水力裂缝的影响规律,采用水力压裂试验系统,以相似材料作为研究对象,进行了水力压裂物理模拟试验,并借助煤岩断面三维扫描系统、位移计提取了水力裂缝信息。试验结果表明,随着主应力差的增大,破裂压力逐渐降低,破裂时间也逐渐缩短;随着主应力差的增大,破裂面的表面积逐渐增加,破裂面变得逐渐粗糙;围压相近时水力裂缝易出现转向、分叉,压裂液的动力效应越明显;水力裂缝张开度随着主应力差的增大而逐渐减小。研究结果可为水力压裂试验的进一步研究、裂缝网络系统的建立提供参考。
In order to study the influence of ground stress on rupture pressure and hydraulic fracture in hydraulic fracturing, a hydraulic fracturing test system was used to simulate hydraulic fracturing with similar materials. With the aid of the three-dimensional scanning system of coal and rock, Displacement meter extracted hydraulic fracture information. The results show that with the increase of the main stress difference, the rupture pressure gradually decreases and the rupture time decreases. With the increase of the main stress difference, the surface area of the rupture surface gradually increases and the rupture surface becomes gradually rougher. The confining pressure is similar When the hydraulic fractures tend to turn, bifurcation, the more obvious dynamic effect of fracturing fluid; the hydraulic fractures open degree decreases with the increase of the main stress difference. The results can provide reference for further research on hydraulic fracturing test and establishment of fracture network system.