Workover of wells with broken casing in Wenweima Oilfield

Workover technology for wells with broken casing is the current bottleneck restricting normal development of oilfields. Workover test is conducted on ?139.7 mm inch casing in Wenweima Oilfield, three types of workover practice are conducted including the technology for workover of eccentric casing pulling machine, the technology for opening bell at the broken casing in short washover tool, and centralization of wells with broken casing. Field test shows that the three technologies significantly increase the success ratio of workover of wells with broken casing, they are easy to use, having short cycle and low cost.