Sell mechanical drilling jar

Description

 The mechanical drilling jar type "JZ" takes the appliance of mechanical structure. And high pressure will not produce in inner chamber as to create a good sealing property and greatly extend the service life. During the drilling operation, the jarring mechanism has no action due to its unique structure which can not be controlled by the common drilling condition and torque, and it's unique structure can accurately transmit the torque. Moreover, the up or down jarring blow is adjustable prior to tripping in and will not change during the downhole operation, keeping a constant jarring load.