Improved downhole hammer

Details Improved downhole hammer Improved downhole hammer

1989-03-16

1990-04-17

Yost, Frank T.

Tool driving or impacting

Impacting devices

Hammer head constitutes piston of drive motor

173 66, 173 79, 175 92, 175215, E21B 1700

Patent

active

049171941

ABSTRACT:
A downhole hammer is provided comprising a casing having a top sub at one end and a drill bit and support at the other end. A central tube is extended therethrough to define an annular space between the casing and the tube. A reciprocating piston is accommodated within the annular space and is operated by injecting a pressurized fluid from the surface into the annular space via a plurality of ports in the casing. The pressurized fluid is exhausted into the central tube and toward the surface via a plurality of passageways therethrough without contacting the borehole.

REFERENCES:
patent: 3795283 (1974-03-01), Oughton

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