Hydraulic drilling jar

Details Hydraulic drilling jar Hydraulic drilling jar

E - Fixed Constructions

21

B

E21B 31/113 (2006.01) E21B 4/14 (2006.01)

Patent

CA 2302977

A hydraulic drilling jar having an outer generally hollow housing, an inner mandrel, an anvil, a hammer, and a hydraulic valve. The mandrel has a first end securable to a drill string and a second end slidably receivable within an end of the housing to form a fluid chamber therewith. The mandrel is slidable within the housing from a contracted position to an extended position. One of the anvil and the hammer is situated on the housing and the other on the mandrel. The valve is received around the second end of the mandrel and in the fluid chamber. Extension of the jar causes the valve to seat against the housing and the mandrel to bifurcate the fluid chamber into first and second portions while pressurizing the first portion to place the jar in a cocked configuration. Further extension of the jar causes a high impact loading of the anvil and hammer portions.

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