煤层气U型对接井施工关键技术

Discussion on Key Technologies of U-shaped Connected Wells Construction for Coalbed Methane

煤层气地面排采先后经历了常规直井、常规定向井、U型井以及羽状分支井等阶段,其中U型井具有同步排采,占地少、最大限度沟通煤层裂隙等优点而逐渐成为当今煤层气地面排采的新宠。以YQ-01井组为例,对U型对接井施工中难点问题进行梳理,提出了各主要施工阶段需要注意事项及技术措施,解决了井眼轨迹控制难、复杂情况高发、水平井与直井连通精度高等问题。节省了钻井成本,为后续煤层气U型对接井施工提供了技术借鉴。

Coalbed methane surface drainage wells has undergone through the stages of conventional vertical wells,directional wells,U-shaped wells and pinnate branch wells,the U-shaped well has gradually become the new favorite method of CBM surface drainage with the advantages of synchronous production,less land occupation and maximizing coal seam fractures connection.Taking YQ-01 well group as an example,this paper sorts out the problems in the construction of U-shaped butted wells and puts forward the attentions and technical measures in main construction stages to solve the difficulties in well trajectory control,high occurrence of complicated situation and high accuracy of horizontal and vertical wells connection with drilling cost saving,which provides technical reference for the subsequent construction of U-shaped butted wells of CBM.