Downhole tool

Details Downhole tool Downhole tool

2006-07-11

2006-07-11

Tsay, Frank S. (Department: 3672)

Boring or penetrating the earth

With self-acting cyclic advance and retraction of tool or...

C175S297000, C173S053000

Reexamination Certificate

active

07073610

ABSTRACT:
A downhole tool for generating a longitudinal mechanical load. In one embodiment, a downhole hammer is disclosed which is activated by applying a load on the hammer and supplying pressurizing fluid to the hammer. The hammer includes a shuttle valve and piston that are moveable between first and further position, seal faces of the shuttle valve and piston being released when the valve and the piston are in their respective further positions, to allow fluid flow through the tool. When the seal is releasing, the piston impacts a remainder of the tool to generate mechanical load. The mechanical load is cyclical by repeated movements of the shuttle valve and piston.

REFERENCES:
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patent: 3361220 (1968-01-01), Brown
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patent: 4284153 (1981-08-01), Reaugh
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patent: 4865125 (1989-09-01), De Cuir
patent: 5033557 (1991-07-01), Askew
patent: 5156223 (1992-10-01), Hipp
patent: 6062324 (2000-05-01), Hipp
patent: WO 97/46791 (1997-11-01), None

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