涪陵页岩水平井生产测井仪器遇卡处理及分析

Processing and analysis of logging tool sticking in Fuling horizontal shale gas wells

针对水平井连续油管输送生产测井工具事故频发,导致仪器受损且影响油气井正常生产的问题,阐述了某实例井现场采用连续油管带低速马达和弹簧卡瓦式打捞筒进行六次打捞的全过程,并分析了遇卡打捞处理措施和遇卡原因。根据生产测井仪器串结构、打捞落物和井口压痕等情况,得出仪器串中柔性接头的中间端面与井口变径是导致仪器串遇卡的直接原因。通过柔性接头室内拉断实验、端面倒角及防磨处理,改进了柔性接头和扶正器结构,提高了现场测试的安全性。该分析为后续水平井连续油管打捞技术的提升提供借鉴。

The frequent occurrence of accidents in CT-conveyed production logging in horizontal wells leads to tool damage and affects the normal production of wells.In this paper,the whole process of six fishing operations using coiled tubing with low-speed motor and spring slip overshot in a well was expounded,and the fishing measures and the causes for sticking were analyzed.According to the structure of the production logging tool string,fishes,and wellhead indentation,it is concluded that the middle end face of the flexible joint in the tool string and the diameter change of the wellhead are the direct causes of the tool string sticking.The flexible joint and centralizer structure were improved through the laboratory pull-off test,end face chamfering,and anti-wear treatment of flexible joints,which improves the safety of on-site testing.This analysis provides a reference for the subsequent improvement of CT-conveyed fishing technology for horizontal wells.