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Both of the upward jarring tonnage and the downward jarring tonnage of QJZ type mechanical drilling jar are adjustable, and the adjustment range is wide. For full mechanical structure, the internal cavity does not produce high pressure to make the seal more reliable and, make the shock effect not affected by changes in oil quality of hydraulic oil. The service life has been significantly improved; The jar with a special flexible joint can effectively reduce the jar itself bending stress. The tool is made of new special materials to ensure higher performance and reliability. The product is widely used for vertical wells, deep wells, complex wells and directional wells. 

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Tianhe Oil Group Huifeng Petroleum Equipment CO. ltd.