Borehole angle control by gage corner removal effects from hydra

Details Borehole angle control by gage corner removal effects from hydra Borehole angle control by gage corner removal effects from hydra

1979-12-10

1981-12-29

Leppink, James A.

Boring or penetrating the earth

With means movable relative to tool below ground to control...

175 61, 175 67, E21B 708

Patent

active

043077862

ABSTRACT:
The advancement angle of a borehole cut by a rotary drill bit of the type which forms a cylindrical sidewall, a drill face and a circumferentially extending gage corner, is controlled by removing a different amount of the gage corner material over a selected partial arc of the gage corner circumference during each rotation of the drill bit. The different amount of material removed causes the remaining arc of the gage corner circumference to apply a slight lateral force on the drill bit, thus forcing the drill bit in a desired direction. Gage corner removal apparatus include a hydraulic fluid jet impinging upon the gage corner. Selectively activating the gage corner removal apparatus during each of a plurality of subsequent drill bit revolutions results in a cumulative angle change effect. Control apparatus is attached to the drill string at a position at which gravity induced sag causes the drill string to contact the low side portion of the borehole. The control apparatus is arranged for deriving energy from contact and rotation of the drill string relative to the low side portion. The energy derived activates the gage corner removal apparatus.

REFERENCES:
patent: 2075064 (1937-03-01), Schumacher et al.
patent: 2153680 (1939-04-01), Schumacher et al.
patent: 2317010 (1943-04-01), Wingard
patent: 2859941 (1958-11-01), Carroll et al.
patent: 2873092 (1959-02-01), Dwyer
patent: 3092188 (1963-06-01), Farris et al.
patent: 3142347 (1964-07-01), Barnes
patent: 3825081 (1974-07-01), McMahon
patent: 3903974 (1975-09-01), Cullen
patent: 4015673 (1977-04-01), Craig, Jr. et al.

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