套管外补贴技术及其在惠州油田的应用分析

Application Analysis on External Casing Patch in Huizhou Oilfield

摘要:

针对海洋油田长时间开发后出现的套管完整性问题，考虑到传统的修补措施如跨越式封隔器等无法满足后期作业对井眼尺寸的要求的现状，提出了套管外补贴技术。介绍了套管外补贴的原理及在惠州油田HZ19-3-6和HZ26-1-16井的应用情况。结果表明，修复后的套管能保持原有强度且产生永久密封，具有不“牺牲”井眼尺寸等优点。针对作业过程中出现的复杂情况进行了深入分析，对海洋油田套管完整性的修复工作具有实践和理论指导意义，同时也给水井、地热井套管的修复提供借鉴和启示。

Abstract:

Aiming at the casing integrity after long period of production, as for the traditional remedial measures, such as with straddle packer, cannot meet the post-operation requirements for borehole size, external casing patch technology was proposed. The paper introduces the principles of the external casing patch and the application in HZ19-3-6 and HZ26-1-16 of Huizhou oilfield. The results show that the repaired casing can maintain the original strength and produce permanent seal with the advantages of remaining borehole size. The analysis is made on the complicated situations in operation process, which has practical and theoretical guiding significance for the repair work of marine oil casing integrity and provide reference and inspiration to casing repair of water well and geothermal well.