煤层气多分支水平井分支井眼重入筛管完井技术

Re-Entry Screen Completion Technology for Multi-Lateral Boreholes in CBM Multi-Lateral Horizontal Wells

为了解决煤层气多分支水平井分支井眼因重入困难、不能下入筛管、无法实现筛管完井的问题,研制了空心结构的筛管完井重入引导工具,优选了煤层气多分支水平井完井方式,给出了分支井眼重入筛管完井施工步骤,形成了煤层气多分支水平井分支井眼重入筛管完井技术。该技术在沁试12平1井的现场试验结果表明,对比重入引导工具与钻进时MWD测得的井眼轨迹数据可判断是否重入成功,筛管能顺利通过筛管完井重入引导工具下至分支井眼,实现分支井眼筛管完井。研究结果表明,煤层气多分支水平井分支井眼重入筛管完井技术,解决了煤层气水平井分支井眼无法重入、不能实现筛管完井的问题。

In order to solve problems caused by difficult re-entry of branched boreholes in CBM multi-lateral horizontal wells,such as the inability to RIH screen and the impossibility to realize the screen completion,a re-entry guide tool for screen completion with hollow structure was developed,the completion technology for multi-lateral borehole in CBM multi-lateral horizontal wells was optimized,and the steps of re-entry screen completion for multilateral borehole were proposed,thereby forming the re-entry screen completion technology for multi-lateral CBM horizontal wells.The technology was tested in Well Qinshi 12-1;and the test results showed that by comparing the re-entry guide tool with the borehole trajectory data measured by MWD,and it could be judged whether the re-entry was successful,and the screen could be RIH to the branched wellbore to achieve the screen completion.The results also showed that the re-entry screen completion technology for multi-lateral CBM horizontal wells solved the problems of difficult re-entry and the screen completion.