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Casing repair and reinforcement process

With the applications of casing withdrawal and replacement process, shaping technique, expansion pipe making-up process, liner reinforcement process, 4 "casing reinforcement process, complete the repair and reinforcement work of casing deformation and wells with broken casings.

Casing withdrawal and replacement process in open hole

The process principle of casing withdrawal and replacement process in open hole is to washover the cement ring and some rocks outside of the casing with special washover tools to make it in a free state, trip in casing splitter and fishing tool to take out the casing above the appropriate position below the broken casing point, and trip in new casing to butt joint the new and old casing with special patch tool or a stab joint. Through years of development and improvement, we have formed a mature casing withdrawal and replacement process. The casing withdrawal and replacement depth has reached 1500m, applicable to 5" and 5-1/2" casing withdrawal and replacement.

Casing withdrawal and replacement within the intermediate casing

Intermediate casing withdrawal and replacement process is a workover process to repair the leakage, cracking and deformation of a production casing within the technical casing, as the finished index of the repaired well is the same as a new well and meeting the needs of oil field exploitation, therefore the casing withdrawal and replacement process is one of the most complete casing-damage well repair method. 100% success rate in replacement of 5" and 5-1/2" production casing within 9-5/8" intermediate casing.