The drilling jar is a new kind of tool used for block release. If stuck, it is released through a heavy up or down jarring on the right place.

     YJ-A Drilling Jar (hydraulic/mechanical) is also an up and down jarring that is designed as an assembly. The jar was developed to overcome the shortcomings associated with purely hydraulic or mechanical jars, yet retain the advantages of both concepts. Less restricted jar placement (in tension, neutral or compression) in the BHA. It characters that the release forces in jarring up or down can be adjusted on the rig on the rig site and its adjusting operation is very simple, exact and stable. It is a new advanced jar.

     QJ-K Drilling Jar (mechanical) is integrated with up and down jarring. It characters simple structure, short length and convenient maintains.

     QJ-A Drilling Jar (mechanical) is also an up and down jarring that is designed as an assembly. It characters that the release forces in jarring up or down can be adjusted on the rig site and its adjusting operation is very simple, exact and stable.

     SS series  Drilling Jar Up (hydraulic) and SX series Drilling Jar Down (mechanical) may be used as a set or trip in separately .

     CS series Fishing Jar Up (hydraulic) characters simple structure and stable performance, and will perform better if used together with the accelerator.

     DX-A series Surface Jar  Down (mechanical) is a new improved tool. The jarring force can be adjusted easily at rig floor.

    The accelerator may be used together with the drilling jar to ensure max jarring efficiency in directional drilling where wall drag is a problem, or in shallow holes where pipe stretch is insufficient. Besides, it can absorb much of the shock of the rebounding string after the jarring , protect  tools and string from damage.