煤层气仿树形水平井钻完井技术研究与应用

Study and Application of Drilling and Completion Technology of CBM Tree-like Horizontal Well

华北油田实施的100多口多分支水平井钻井事故率较高,达到了38%。因此急需对煤层气多分支水平井钻完井技术进行创新,增加多分支水平井的成井效率,在此基础上提出了仿树形煤层气水平井开发理念。把主支置于稳定的煤层顶板泥岩内,形成长期稳定的排水采气通道;分支侧钻进入煤层,控制排采面积;脉支在煤层内钻进,增加煤层气产量。

The drilling accident rate of more than 100 multi-lateral horizontal wells in Huabei Oilfield Company is 38%.Therefore,it is urgent to improve the drilling and completion technology of CBM multi-lateral horizontal wells and increase the well completion efficiency.On this basis,this paper puts forward an idea for the design of a CBM tree-like horizontal well.In the drilling of this type of wells,the trunk is placed in the stable mudstone of the coal seam roof to form a long-term and stable drainage gas production channel,the sub-branchesare drilledfrom the trunk into the coal seam to control the drainage area,and the twigsare drilled in the coal seam to increase the gas production.