Mechanical Drilling Jar Type JZ

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 so as to keep a constant jarring load. Type JZ95 JZ108 JZ121 JZ159III JZ165 JZ178 JZ203 JZ229 OD mm 95~229 ID mm 28~76 Max Tensile Load mN 0.5~2.5 Max Working Torque kN.m 5~22 Pump open area cm2 32~181 Up Jarring Stroke mm 144.5~203 Down Jarring Stroke mm 176.5~205 Overall Length(Locked)mm 2800~7753