Downhole drilling system

Details Downhole drilling system Downhole drilling system

E - Fixed Constructions

21

B

255/12

E21B 4/00 (2006.01) E21B 3/04 (2006.01) E21B 4/20 (2006.01) E21B 19/22 (2006.01)

Patent

CA 1119581

Abstract of the Disclosure A downhole drilling system utilizes a non-rotating kelly bushing for locking in the torque created in the drill string by the downhole drilling motor. The kelly bushing prevents rotational movement of the kelly secured to the drill string on which the downhole motor is attached. The kelly bush- ing includes a torque mechanism for enabling the kelly and the attached drill string to move in & forward direction into the hole being drilled while prohibiting any rotational movement. A guide mechanism is provided in the kelly bushing for enabling an electrical wire to be attached to either the downhole motor or a sensing mechanism located in the area of the downhole motor for feeding back to the surface appropriate electrical signals in- dicative of certain drilling operations.

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