基于水力压裂裂缝扩展规律的天然气开发应用

Application of natural gas development based on hydraulic fracturing crack propagation law

为进一步探究致密砂岩地质环境下的天然气资源开采工作注意事项,以西南地区某地致密砂岩地质环境下的天然气田为研究案例,应用ABAQUS数值模拟分析软件,结合前期地质勘查资料展开较为详细的建模分析,重点探究了应用水平井分段压裂技术开采时,水力裂缝长度和分段间距两项关键指标对开采效果可能造成的影响。结果显示,在实际开采过程中,应当控制井壁处诱导应力差值,避免其过大或过小,因而也需要避免水力裂缝长度和分段间距过低或过高;相对而言,控制水力裂缝长度为100~200 m内,且控制分段间距为50~100 m时,有利于致密砂岩地质环境下的复杂裂缝的产生,此时对开采工作也相对较为有利。

In order to further explore the precautions for natural gas resource exploitation in the tight sandstone geological environment,taking a natural gas field in a tight sandstone geological environment in a certain area of southwest China as a research case,the ABAQUS numerical simulation analysis software was applied,and combined previous geological exploration data to carry out a detailed modeling analysis.The focus was on exploring the application of horizontal well segmented fracturing technology for mining,the possible impact of two key indicators,hydraulic fracture length and segment spacing,on the mining efficiency.The results show that in the actual mining process,the induced stress difference at the shaft wall should be controlled to avoid being too large or too small.Therefore,it is also necessary to avoid the values of hydraulic fracture length and segment spacing being too low or too high.Relatively speaking,controlling the length of hydraulic fractures within the range of 100-200 m and the segment spacing within the range of 50-100 m is beneficial for the generation of complex fractures in tight sandstone geological environments,at this time,it is also relatively advantageous for mining work.