Drilling system with means for anchoring in the borehole

Details Drilling system with means for anchoring in the borehole Drilling system with means for anchoring in the borehole

E - Fixed Constructions

21

B

E21B 4/18 (2006.01) E21B 7/06 (2006.01) E21B 47/18 (2006.01)

Patent

CA 2296464

An extended reach drilling (ERD) system for drilling a borehole in an underground formation is provided. The ERD system comprises: a) a drill bit, b) a motor for driving the drill bit, c) a drill-pipe to surface, d) a hydraulic cylinder/piston arrangement for providing the required weight on bit, the drill-pipe being coupled to a selected one of the cylinder and the piston of said cylinder/piston arrangement by swivel means allowing rotation of the drill pipe relative to said selected one of the cylinder and the piston, the drill bit being coupled to the other one of the cylinder and the piston, and e) locking means for locking said selected one of the cylinder and the piston against the borehole wall, the locking means being operable between an engaged position and a disengaged position.

L'invention concerne un système de forage à portée étendue (ERD) destiné au forage d'un trou dans une formation souterraine. Le système d'ERD comprend: a) un trépan, b) un moteur d'entraînement du trépan, c) un conducteur tubulaire vers la surface, d) un montage cylindre hydraulique/piston permettant d'obtenir le poids requis sur le trépan, le conducteur tubulaire étant couplé au cylindre ou au piston de ce montage cylindre/piston par une tête d'injection permettant la rotation du conducteur tubulaire par rapport au cylindre ou au piston et le trépan étant couplé à l'autre élément du montage cylindre/piston, et e) un dispositif de verrouillage destiné à verrouiller le cylindre ou le piston contre la paroi du trou de forage, le dispositif de verrouillage pouvant être actionné entre une position de prise et une position de dégagement.

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