连续油管打捞连续油管关键工具研究与应用

针对用常规管柱打捞连续油管作业效率低、风险和施工强度高等问题，在调研连续油管作业技术现状的基础上，提出了连续油管打捞连续油管的思路，针对现场技术需求研发了专用打捞工具。通过模块化结构设计，在专用打捞工具中集成了鱼顶旋转引入、鱼顶检测、鱼顶抓获及剪切等功能机构，使其能够适应连续油管打捞连续油管的工况。模拟计算和室内试验证明，专用打捞工具的性能达到了设计要求。该专用打捞工具在塔里木油田X–1井?88.9 mm生产管柱内进行了13次打捞连续油管的作业，累计捞获井内严重遇卡的?38.1 mm连续油管2 851.87 m，捞获率100%，作业效率是常规管柱打捞作业的4倍，验证了专用打捞工具性能的稳定性。研究结果表明，连续油管专用打捞工具能够满足打捞连续油管的要求，可提高打捞连续油管的成功率和作业效率。 

The Research and Application of a Key Tool for Coiled Tubing Fishing with Coiled Tubing

In view of the low efficiency, high risk and high labor intensity of coiled tubing fishing with a conventional tubing string, research was conducted to investigate the current status of coiled tubing operation technologies. The process of coiled tubing fishing with coiled tubing was proposed, and a specific tool was developed. By virtue of its modular design, the tool was able to integrate the functions of fish top rotation entrance, fish top detection, fish top capture and shearing into the tool, so that the tool could adapt to the operation conditions of coiled tubing fishing. The results of simulation calculation and laboratory test verified that the performance of this tool met the desired design requirements. This fishing tool was used in Well X–1 of Tarim Oilfield on coiled tubing, and it finished 13 fishing jobs in ?88.9 mm production string. In total 2 851.87 m of ?38.1 mm coiled tubing that had been seriously stuck in the hole was retrieved, and the retrieval rate was up to 100%, while the fishing efficiency was four times higher than that of the conventional fishing string. The field application also verified the stability of tool’s performance. Studies suggested that this coiled tubing fishing tool could also be effectively applied in coiled tubing fishing, and it could provide technical references in the future for fishing in coiled tubing.