Past and future of the technology of workover rigs in China

The paper retrospects the way of introducing, digesting and redesigning of workover rig from the view of technique,and now the workover rig has become serial production and come into mass production,and the dominant product has exported to overseas.The author reviewed the foundation work and product design of workover rig,and analyzed the deficiency and put forward the improving ideas,and also point out the developing trend of workover rig.As the hydraulic elements become more reliable,it is necessary to develop and manufacture hydraulic workover rig.In order to overtake the world advanced level of drilling and exploration equipment,the research and development of AC frequency conversation workover rig should put into effect.