Abstract: There exist a lot of difficulties during workover of high pressure gas wells, such as the difficult well killing, high risk of blowout, difficult reservoir protection. To solve these problems, four new technologies are used, including the selective tree-like workover designing technology, the temporary plugging technology using hydrogel, the technology for monitoring gas content in logging process, the technology for developing new type washover tools and software which can optimize washover parameters. Through the application of the technologies, one success is achieved in killing wells and fishing the lost items. What’s more, the hazard of blowout is prevented and the gas producing zone is protected. The workover experience in the well can be good reference to the workover and completion of similar gas wells in the future.