煤层气藏水平井分段压裂裂缝参数优化

Fracture Parameter Optimization of Fractured Horizontal Well of Coal Bed Gas Reservoir

研究区块煤层气藏储层渗透率极低,使用水平井分段压裂技术有利于煤层气的开发。针对不同裂缝参数对水平井产能的影响,进行数值模拟研究,并优选出最佳的裂缝组合形式。首先,结合研究区块的地质特征,采用双孔模型进一步证明了压裂的必要性,并在此基础上,优选出最佳的裂缝参数组合形式为:1 500 m水平段上压裂15段,共45条主裂缝,裂缝间距为33 m,裂缝半长为350 m,导流能力为100 m D·m。该研究思路及方法对煤层气藏水平井的分段压裂具有指导意义。

The permeability of coal bed gas reservoir in the research area is ultra-low. Staged fracturing of horizontal well is advantageous to the exploitation of coal bed gas reservoir. Considering the impact of fracture parameter on productivity of the fracturing horizontal well, this paper made numerical simulation study to optimize fracture parameters. According to the actual geological characteristics of the research area, this paper used dual-porosity to prove the necessity of staged fracturing. Based on the results of test, the best fracture pa- rameters combination form are as follow： fracturing 15 stage on 1 500 m horizontal section,fracture number is 45, fracture spacing is 33 m, fracture half-length is 350 m, fracture conductivity is 100 mD.m. This paper＇s research thoughts and methods have an instructive sig- nificance for the staged fracturing of horizontal well of coal bed gas reservoir.