CSJ type super fishing jar is a fishing tool that the jarring force larger than other jar with same specification. It features a closed structure, reliable performance, easy to adjust and easy to operate. It is a new type of up jarring tool used in oilfield, geological exploration and drilling operation.

The surface jar is an effective tool for resolving the problem of stuck drill tool in down hole. It is connected with the surface section of drill string, the device to adjust the tonnage shall protrude from the rotary disc face, the violent down jarring to the stuck catch can be clearly seen when the surface jar makes jarring operation. The jarring strength for the tool can be easily adjusted and it is an easy operated, unique designed tool that can make continuous down jarring. The surface jar, which not only can bear heavy load and strong torque, but also owns a good sealing property and can withstand the mud circulation with high pump pressure, has proven to be an safe, successfully effective releasing tool through many years’ application.

The ZJS type jar intensifier is a down hole fishing jar designed to increase jarring energy to up jar. Therefore, it must be run in conjunction with CSJ type super jar or YSJ type hydraulic up jar. Its function mainly is to to supply acceleration to the upper end of the jar during the free jarring stroke. With a special function, the intensifier is essentially a fluid spring that not only can accelerate the up jarring action but also make the jarring action directly to strike on the fish and reduce damages to the drill tool and fishing tool.