QYSZ DOUBLE ACTING HYDRAULIC DRILLING JAR

Working principles

● Upward Jarring 

Lifting the drill stem gives the hydraulic jar an upward force, moving the upper hydraulic mechanism along with it. This generates an increased pressure in the working fluid. Thus, when the jar reaches a predetermined stroke, the fluid pressure is released, creating an upward jarring force, releasing the stuck drill stem.

● Downward Jarring

Downward force is applied on the hydraulic jar, to create pressure in the  working fluid of the lower hydraulic mechanism. When the jar reaches a  predetermined stroke, the fluid pressure is released, creating a downward  jarring force to release the struck drill tools.