Underreamer

Details Underreamer Underreamer

1997-09-10

1999-04-27

Tsay, Frank

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Cutter element shifted by fluid pressure

E21B 728

Patent

active

058969403

ABSTRACT:
An underreamer with pressurized water activated lateral cutters pivotally mounted thereon and being spring biased to urge them in longitudinal alignment with the underreamer. A removable constrictor socket is cooperatively mounted adjacent to the distal end of the piston rod so that a user can select one of several designs depending on the magnitude of drill fluid pressure to be applied on the bottom of the well. The lower end of the underreamer is provided with several contiguous cutting teeth arranged in a circle with a relatively small separation inbetween so that it may continue to work even if the well collapses. The cutting teeth enhance the turbulence of the drill fluid. The underreamer is lubricated with drilling fluid applied up to a predetermined pressure without opening the lateral cutters. After a given predetermined amount of pressure, the lateral cutters open perpendicularly.

REFERENCES:
patent: 1478306 (1923-12-01), Sweetman
patent: 2872160 (1959-02-01), Barg
patent: 3171503 (1965-03-01), Shirley
patent: 4431065 (1984-02-01), Andrew
patent: 4461361 (1984-07-01), Fuchs
patent: 5139098 (1992-08-01), Blake
patent: 5201817 (1993-04-01), Hailey
patent: 5402856 (1995-04-01), Warren et al.

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