Boring or penetrating the earth – Processes – Boring with specific fluid
Patent
1996-08-01
1998-08-04
Bagnell, David J.
Boring or penetrating the earth
Processes
Boring with specific fluid
175324, E21B 718
Patent
active
057879982
ABSTRACT:
A jet assisted drill system which uses a high pressure intensifier, positioned in a down hole drill assembly. Drill fluid from a drill stem is directed into the drill assembly, and in one mode this drill fluid is passed through the pressure intensifier to cause a piston assembly of the intensifier to reciprocate, with high pressure pistons of the piston assembly delivering high pressure drill fluid to a discharge jet in the drill bit assembly. The lower pressure fluid which drives the low pressure pistons is discharged into a downstream annular passageway and to the drill bit assembly. In a by-pass mode, a selector valve directs drill fluid from an upstream main passageway portion directly to a downstream main passageway portion to pass out the drill bit assembly. This flushes out debris which is carried upwardly out of the drill hole. There is a control valve to operate the piston assembly and a trigger valve operated by the piston assembly to direct fluids selectively to the control valve.
REFERENCES:
patent: 4921306 (1990-05-01), Tomlin
patent: 5246080 (1993-09-01), Horvei et al.
Kelley Douglas P.
O'Hanlon Thomas A.
Veenhuizen Scott D.
Bagnell David J.
Flowdril Corporation
Hughes Robert B.
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