The Well Workover Technology of Cement Casing Patch Reinforcement and Application in Well Shi 6-11

At present, as most developed oil fields entered anaphase, down-hole casings of oil and water well are seriously damaged, and become a limitation factor to improve recovery efficiency of developed oil fields. Aiming at damaged casing, such as casing deformation, failure and dislocation, in order to mend the damaged casing, the well work-over technology of cement casing patch reinforcement transports good casing to the damaged casing place by pipe column and patch the good casing on it by working with the cement plugging technology. The principle of this well work-over technology is simple, and operated easily. It offers precious experience to mend wells with damaged casing and improve the level of reservoir development after successful application in well Shi 6-11 of Shinan oil field in Shengli.