煤储层高能气体加载压裂下裂缝扩展研究

Study of coal reservoir fracture extension under the loading of high energy gas fracturing

针对我国煤储层的＂三低＂特性及水力压裂过程中所产生压降损耗过快及成本较高的难题,开展煤储层的高能气体压裂下的裂缝扩展研究。研究表明：高能气体压裂可在煤储层中产生以3~8为主体的裂缝网络体系,且裂缝方位不受地应力的控制,只与压裂药燃烧释放能量的方位有关,与最大能量释放的角度基本一致。这对煤层气储层的压裂开发以促进其解吸、扩散、渗流过程提供了新的研究思路。

Aim at the ＂three low＂ characteristics of coal reservoir and the problems that pressure drops too fast in the process of hydraulic fracturing and the high cost.We conduct the study to study the fracture under the loading of high energy gas fracturing in the coal reservoir.The study shows,the technology can develop the fracture network system with 3 ~ 8the main body and the fracture azimuth is not controlled by the in-situ stress.It is only associated with the azimuth of fracturing burning drug release energy and it is consist with the azimuth of fracturing burning drug release energy.So it provides a new idea to the fracture development of the coalbed methane reservoir so as to promote its desorption, diffusion and percolation process.