Method for guiding rotary drill

Details Method for guiding rotary drill Method for guiding rotary drill

1980-06-26

1983-06-07

Leppink, James A.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

Tool position direction or inclination measuring or...

175 62, 299 12, E21B 704

Patent

active

043866646

ABSTRACT:
A method of controlling the direction of a generally horizontal borehole drilled with a rotary drilling unit in a subterranean formation such as a coal seam. The method comprises predetermining drilling conditions for the formation being drilled and the equipment being utilized which will provide an upward buildup to the borehole trajectory, a downward change in trajectory, or a substantially level borehole trajectory. The predetermined conditions include the number of drill bit revolutions per unit length of borehole drilled. Periodic borehole surveys indicate to an operator which set of drilling conditions should be utilized for the next increment of hole drilled to maintain the hole within the boundaries of the formation being drilled.

REFERENCES:
patent: 2646253 (1953-07-01), Johnston
patent: 2646254 (1953-07-01), Johnston
patent: 4015673 (1977-04-01), Craig, Jr.
patent: 4108256 (1978-08-01), Moore
Bureau of Mines Report, U.S. Department of the Interior, Rotary Drilling Holes in Coalbeds for Degasification by Joseph Cervik, 1975, pp. 1-21.

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