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为探究煤储层中天然裂缝对形成裂缝网络的影响机理,以人工预置裂缝的相似材料试件为研究对象,采用室内试验系统进行了水力压裂物理模拟试验,并通过三维扫描系统对破裂面信息进行处理。结果表明:煤储层中天然裂缝的存在导致起裂压力降低,泵注压力产生二次峰值;不同的天然裂缝形态对水力裂缝的延伸路径影响也不同,平行于最大主应力方向的天然裂缝影响尤为明显;压裂过程中主裂缝遇到天然裂缝后,水力裂缝的延伸路径发生变化,主裂缝与天然裂缝发生贯通、扩展延伸,形成裂缝网络系统,为煤层气提供了快捷的运移通道。
In order to explore the mechanism of the natural fractures in coal reservoirs to form the fracture network, a hydraulic fracturing physical simulation test was carried out by indoor test system with specimens of similar material prefabricated by fractures. The fractures were cracked by 3D scanning system Surface information for processing. The results show that the existence of natural fractures in coal reservoirs leads to the decrease of initiation pressure and the second peak of pump pressure. The effect of different natural fractures on the extension path of hydraulic fractures is also different. The natural fractures parallel to the direction of maximum principal stress It is especially obvious that after the natural fractures are encountered in the main fractures, the extension path of the hydraulic fractures changes. The main fractures and the natural fractures penetrate, extend and extend to form the fracture network system, which provides a quick migration channel for the CBM.