Valve assembly for a downhole to remove bore hole subsidence

Details Valve assembly for a downhole to remove bore hole subsidence Valve assembly for a downhole to remove bore hole subsidence

1989-08-28

1991-10-15

Neuder, William P.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

173136, E21B 100

Patent

active

050566091

ABSTRACT:
A downhole hammer having a fluid inlet controlled by a check valve. The valve assembly is used to remove subsidence from a bore hole to prevent problems caused by bore hole collapse. The valve assembly contains a housing and fluid inlet and outlet. A valve is positioned in the housing between the fluid inlet and outlet. A bypass passageway is also provided in the housing between the fluid inlet and the bore hole exterior.

REFERENCES:
patent: 3038548 (1962-06-01), Brown
patent: 3570611 (1971-03-01), Riziue et al.
patent: 4660658 (1987-04-01), Gustafsson

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