Title: Method for guiding rotary drill

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.

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Inventors: Miller, Thomas R. (Waynesburg, PA)

Application Number: 06/163245
Filing Date: 1980-06-26
Publication_date: 1983-06-07
Assignee: CONOCO INC

Primary Class(es): 175/45 299/12, 175/62
Other Classes: E21B7/04; E21B47/022; E21B47/02; E21B7/04
US Patent Ref:

2646253	July, 1953	Johnston	175/61	Directional drilling
2646254	July, 1953	Johnston	175/61	Method for controlling deviation in drilling
4015673	April, 1977	Craig, Jr.	175/61	Directional drilling system
4108256	August, 1978	Moore	175/61	Sliding stabilizer assembly

Other Refs: Other References: Bureau of Mines Report, U.S. Department of the Interior, Rotary Drilling Holes in Coalbeds for Degasification by Joseph Cervik, 1975, pp. 1-21.

Primary Examiner: Leppink, James A.
Assistant Examiner: Neuder, William P.
Attorney: Collins, Richard W.

Claims:

I claim