Uphole hammer

Details Uphole hammer Uphole hammer

1992-04-02

1993-08-24

Dang, Hoang C.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

175 19, 175 92, 175296, E21B 414, E21B 728, E21D 300

Patent

active

052380734

ABSTRACT:
An uphole hammer is provided comprising a substantially tubular housing which is closed at a first end and supports a substantially centrally located fluid supply tube at the first end. The fluid supply tube extends axially through the housing and is adapted to be mounted at its other end to a drill string, the fluid supply tube being adapted to receive fluid being directed to the hammer by the drill string. The housing further supports a drill bit at or towards its other end which is slidably received about the fluid supply tube, a piston also being slidably supported about the fluid supply tube in the housing for reciprocation between the drill bit and the first end of the housing. A fluid port is also provided to alternatively admit fluid to the spaces defined between each end of the piston and the respective ends of the housing to effect reciprocation of the piston between a first position at which it impacts on the drill bit and a second position at which it lies in the vicinity of the first end of the housing.

REFERENCES:
patent: 3730283 (1973-05-01), Kostyler et al.
patent: 4249620 (1981-02-01), Schmidt
patent: 4384624 (1983-05-01), Duke et al.
patent: 4410053 (1983-10-01), Masse
patent: 4878547 (1989-07-01), Lennon
patent: 4921052 (1990-01-01), Rear
patent: 5090487 (1992-02-01), Masse
patent: 5096000 (1992-03-01), Hesse
patent: 5127481 (1992-07-01), Hesse

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