Apparatus and method for directional drilling

Details Apparatus and method for directional drilling Apparatus and method for directional drilling

E - Fixed Constructions

21

B

255/6

E21B 7/06 (2006.01) E21B 7/08 (2006.01)

Patent

CA 1122965

Case No. 6116 APPARATUS AND METHOD FOR DIRECTIONAL DRILLING Abstract of the Disclosure A method and apparatus for drilling a horizon- tal borehole through a subterranean mineral bed with a drilling assembly including a drill shaft connected to a down-hole motor and drill bit. A deflection device is positioned between the down-hole motor and the drill bit. The deflection device applies a predetermined per- pendicular force to the drill bit causing the borehole to deviate from the drill shaft axis in the direction of the force. The method includes periodically survey- ing the borehole to determine its position relative to the top or bottom of the mineral bed, and rotating the drill shaft through a half turn sequentially to provide an alternating upward and downward trajectory to the borehole within the upper and lower boundaries of the mineral bed.

343775

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