Research On Casing Repair Technology For Casing Damage Wells

With the production of oilfields, based on the followling factors such as hydraulic system, pressure field, and frequent stimulation treatments or workovers make the casing status become worse and worse, so the more and more casing damage phenomena occur.This paper details project objectives, job design, and implementation. It presents the casing repair mechanism of the casing damage wells, which solve the integer and reaming of the small bore size well and the casing repair of long wellbore casing section. Moreover, the project finished the mechanics analyses and gained the mathematical model, and a set of hydraulic integer tools have developed. The new tools can settle many problems caused by traditional mechanical integer tools , such as, short casing section, more tools, difficult pulling out.In addition, two projects are finished, in which apply downhole butt joint technology to realize the reinforcement of the long wellbore casing section, totaling more than 50 m in length. This contributed to improved workover economics and quick implementation of lessons.