Converted dual-acting hydraulic drilling jar

Details Converted dual-acting hydraulic drilling jar Converted dual-acting hydraulic drilling jar

1997-07-15

1999-11-16

Bagnell, David J.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

166178, E21B 31113

Patent

active

059840285

ABSTRACT:
A jar up, bump down hydraulic drilling jar is described. A hydraulic tripping valve arrangement permits the storage of large amounts of static force before releasing a hammer to strike an anvil surface with substantial force. The hammer is positioned on the mandrel and interacts with the anvil surface in the housing to deliver upward jarring forces, to the drill string. During a downward jarring movement, the tripping valve is opened to prevent pressure buildup and accidental downward jarring; thus, a single-acting drilling jar is formed.

REFERENCES:
patent: 4361195 (1982-11-01), Evans
patent: 5086853 (1992-02-01), Evans
patent: 5318139 (1994-06-01), Evans
patent: 5466546 (1995-11-01), Evans

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