Method and apparatus for rotary drill guidance

Details Method and apparatus for rotary drill guidance Method and apparatus for rotary drill guidance

1982-04-23

1984-09-18

Pate, III, William F.

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

175 61, 175 62, 175 65, E21B 704

Patent

active

044718438

ABSTRACT:
A process for controlling the direction of advance of a generally horizontal borehole extended through a subterranean coal-bearing formation by a rotary drilling operation. As the drill string is rotated in the hole, the advance of the drill bit is guided along a designated path by repeatedly deflecting the drill string from its axis in a constant radial direction. The drill string may also be centralized and the deflection operation carried out either within or outside of the drill-pipe segment between the bit and the centralizer. A deflection unit includes a plurality of deflector pads disposed about the periphery of a segment of the drill pipe. The deflector pads are cyclicly actuated to sequentially place each pad in an extended position at a constant rotational position of the drill pipe segment.

REFERENCES:
patent: 2316409 (1943-04-01), Downing
patent: 2712434 (1955-07-01), Giles
patent: 3554302 (1971-01-01), Adkins
patent: 3595326 (1971-07-01), Claycomb
patent: 3888319 (1975-06-01), Bourne, Jr. et al.
patent: 4305474 (1981-12-01), Farris
"Rotary Drilling Holes in Coal Beds for Degasification," Bureau of Mines Report of Investigation 8097, U.S. Department of the Interior, 1975, Joseph Cervik et al.

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