取换套管技术在YC1井的研究与应用

Research and application of casing replacement technology in YC1 well

YC1井生产套管破损,需进行取换套管作业。针对深部取换套管的特点,借鉴封隔器式套管对接方法的优点,设计了Ø178 mm套管外插筒工具,制定相应的施工工艺,通过提断、回接、切割、取出旧套管,经过修磨鱼顶、新旧套管对接及注水泥固井、钻水泥塞、试压等工序,成功取换Ø139.7 mm生产套管2 499.85 m,刷新中石化取换套管最长纪录,为深井取换套管提供了成功经验。

The production casing of well YC1 was damaged and the casing removal and replacement operation was required.According to the characteristics of deep casing removal and replacement,combined with the advantages of packer type casing docking method,aØ178 mm casing outer casing tool is designed and developed,and corresponding construction technological measures are put into practice.Through lifting off,tie-back,cutting,taking out the old casing,after repairing and grinding the“fish top”,butting the old and new casing,cementing,drilling cement plugs,and pressure test,etc.,2499.85 m ofØ139.7 mm production casing was successfully removed and replaced,which set a new record for the longest casing removal in Sinopec Group,and provided a successful experience for deep well casing removal and replacement.