Apparatus and method for directional drilling with coiled...

Details Apparatus and method for directional drilling with coiled... Apparatus and method for directional drilling with coiled...

E - Fixed Constructions

21

B

E21B 7/04 (2006.01) E21B 4/02 (2006.01) E21B 7/06 (2006.01) E21B 17/03 (2006.01)

Patent

CA 2376823

An improved coiled tubing directional drilling method comprises: providing a bent housing which is rotatably coupled to the coiled tubing, rotating the drill bit, and rotating the bent housing. Apparatus for achieving the method comprises: a rotary connection between the coiled tubing and the bent housing and means for rotating the bent housing relative to the coiled tubing and to the drill bit. A fluid pressure-operated clutch enables alternate rotation and locking of the bent housing. Preferably, a first downhole motor rotates the drill bit and a second downhole motor rotates the bent housing through the clutch or alternately a speed reducer permits the bent housing to contra-rotate slowly under reactive torque developed by the rotating drilling bit.

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