Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1978-07-27
1980-07-08
Leppink, James A.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 73, 175 93, E21B 708
Patent
active
042112923
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 selectively extendable cutter devices, a hinged connector hingeably connecting the drill bit to the end of the drill string, a pivotable single cutting wheel member, a hydraulic fluid jet impinging upon the gage corner, and apparatus for delivering additional drillable particles to 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.
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patent: 3595326 (1971-07-01), Claycomb
patent: 4040494 (1977-08-01), Kellner
Leppink James A.
Ley John R.
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