1 875 wireline knuckle jar

... effective jar force up and down. The effect of the jar is largely determined by the weight of the connecting rod on the jar and the stroke of the jar. The size and verticality of the tubing, the size and depth of the tool, the density and viscosity of...

...transmit effective jarring forces up and down. The knuckle jar not only has the rotation and change function of the universal section, but also has the function of the jarring, which is usually applied in some workings where the tool length is limited and...

... on the wireline the top sub and mandrel are pulled upward while the piston is impeded in its upward movement by the Hydraulic fluid. This delaying action of slick line hydraulic jar allows sufficient strain to be taken on the line to strike a blow of the...