Downhole recirculating hammer

Details Downhole recirculating hammer Downhole recirculating hammer

1989-03-23

1990-05-01

Watts, Douglas D.

Tool driving or impacting

Work cleansing

Cleansing fluid passage through hammer head

173 80, 175215, E21B 406

Patent

active

049210521

ABSTRACT:
A downhole reverse circulation hammer is provided comprising a tubular housing and a top sub and drill bit supported mounted on either end of the housing. A central axis tube extends through the housing, top sub and drill bit support and a piston is slidably positioned in the tube. The hammer has a network of fluid passageways and spaces which enable the piston to reciprocate against an anvil in response to the entry and exit of a fluid into the spaces via the passageways.

REFERENCES:
patent: 3795283 (1974-03-01), Oughton
patent: 3941196 (1976-03-01), Curington et al.
patent: 3991834 (1976-11-01), Curington

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