裂缝参数对煤层气水平井产气流速的影响  

Influence of fracture parameters on CBM flow rate of CBM horizontal well

作　　者：梁冰[1] 孙雅楠[1] 秦冰[1] 孙维吉[1] 谭震[2] 曹竹[1] 

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《辽宁工程技术大学学报（自然科学版）》2016年第12期1377-1383,共7页Journal of Liaoning Technical University (Natural Science)

基　　金：国家重点基金研究发展计划(973计划)项目(2011CB201206);辽宁省科技厅项目(20131044);辽宁省教育厅项目(L2013136)

摘　　要：针对储层与井身的不同距离,建立不同流动速度的线性-非线性渗流的Darcy-Brinkman流场数学模型,采用数值模拟的方法分析了裂缝半长、裂缝条数、裂缝宽度对煤层气流速的影响规律.研究结果表明:随着裂缝半长、条数、宽度的增加,压裂面积增大,增大了井身与裂隙的接触面积,增加了气体排泄的面积,同时储层压强差梯度增大,促使更多的流体流进井口内,从而使煤层气的流速增加.对于相同地质条件的煤层气藏,裂缝半长、条数、宽度并不是越大越好,通过正交试验得出裂缝参数对压裂井产能影响的重要性依次为裂缝条数、裂缝半长、裂缝宽度.因此合理改变裂缝参数有利于提高煤层气流速,控制压降速率和增大压降范围.According to the different distances from the reservoir and the well bore, this paper established the Darcy-Brinkman flow field coupled model of linear and nonlinear seepage with different flow speed. The numerical simulation method was used to analyze the influence law of the fracture half-length, the fracture number, and the fracture width on the CBM flow rate. The results show that it is increased for the fracture area with the fracture half-length, the fracture number, the fracture width increasing, and it is increased for the contact area between the well bore and fractures and the gas excretion area. At the same time, it is also increased for the chance of the reservoir pressure difference, so that it is to make more fluid flow into the well, so it is increased for the CBM gas flow rate. For the CBM reservoir of the same geological conditions, the fracture half-length, the fracture number and fracture width are not the bigger the better. And through the orthogonal experiment got the importance ranking of fracture parameters effecting fracturing well productivity, that is fracture number, fracture half-length, and fracture width. Therefore, it is used for improving the CBM gas flow rate, controlling the pressure drop rate and increasing the pressure drop range to change the fracture parameters reasonably.

关 键 词：煤层气 水平井 裂缝参数 模拟计算 渗流力学 

分 类 号：P618.11[天文地球—矿床学]