Method and apparatus for controlling the force applied to a...

Details Method and apparatus for controlling the force applied to a... Method and apparatus for controlling the force applied to a...

E - Fixed Constructions

21

B

255/12, 255/25

E21B 4/02 (2006.01) E21B 44/00 (2006.01)

Patent

CA 1306244

ABSTRACT OF THE DISCLOSURE A method of apparatus for controlling in a well- bore the force applied to a rotating drill bit of the type having fluid circulating through an opening in the lower end thereof. One aspect of the method comprises sensing the torque in the drill bit and varying the flow of the circulating fluid through the drill bit responsive to the torque. Apparatus is provided for maintaining constant torque in the drill bit by varying the fluid flow through the bit, which varies in turn the weight applied to the bit and therefore bit torque.

522439

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