PROTECTION SLEEVE

摘要

A protection sleeve (12) for locking over a seal (72) in a wellbore is described. The sleeve (12) is adapted for releasable engagement to a running tool (14) and has a locking mechanism (28) comprising first and second tubula members and a collet (56) is provided. One tubular member includes a profile adapted to mate with a profile of the seal (72) . The sleeve (12) may be located on a work string (14) , including a rotary drill string, and the invention also relates to methods of running in, setting, carrying out an intervention operation and retrieving the sleeve in a single run. The invention has particular application in Through Tubing- Rotary Drilling (TTRD) .