Application of JK-120 hydraulic lifting jack to offshore workover;

Fishing technique in horizontal well has always been the tackling key problem for workover engineers and it is also the difficulty in workover job.

At present,the workover operation depends on manual work too much.

Along with the development of oil and gas production,well workover has become a indispensable work.

This paper introduced the present situation and development tendency on the foreign completion technology,fracture acidizing,artificial lift,well workover,and laboratory experiment,it is useful for the development of the gas production engineering technique in China.

Development and application of well control device for well servicing operation;

Development and application of remote-controlled pneumatic spider for well servicing;

Domestic and international technology status and development of well repair device is fully introduced,in which well repair device under pressure is emphasized.

And taking magnetic particle inspection results of one downhole services company s three workover masts as examples,the characters of defects were analyzed.