Temperature compensating hydraulic jarring tool

Abstract From the Canadian patent

Abstract of the Disclosure, A hydraulic jarring tool is provided that vents pressure slowly from the tool's internal operating fluid chamber to allow maximum filling of the tool prior to the tool's entering a well and to provide for operating fluid expansion with temperature increases. The jarring tool includes an outer member and an inner member telescopically arranged. Spline means between said outer member and said inner member transmit torque. A hammer and anvil system provide a jarring effect upon actuation of the tool. An operating fluid is maintained in an operating fluid chamber between the outer and inner members. Seal means between the outer and inner members provides a fluid seal …