Directional drilling system for hard rock

Details Directional drilling system for hard rock Directional drilling system for hard rock

E - Fixed Constructions

21

B

E21B 7/04 (2006.01) E21B 4/16 (2006.01) E21B 7/06 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2365874

A bottom hole assembly having a bent housing (4), and a reciprocating hammer (2) driving a bit (1) for forming a borehole in rock. A motor (14) operating through a gear reduction device (13) rotates the reciprocating hammer (2) and thus the bit (1). The drill bit (1) can thus bore a directional hole in the hard rock without rotating the drill string. The rotary drive motion of the motor (14) can be coupled to the reciprocating hammer (2) through shock absorber (10) and flexible couplings (9). The bent housing (4) is supported in the borehole during directional drilling by a frontal thrust pad stabilizer (18) and a rear stabilizer (19).

Ensemble de fond de trou, doté d'une enveloppe courbe (4), et d'un marteau à va-et-vient (2) commandant un trépan (1) pour former un trou de sonde dans la roche. Un moteur (14) fonctionnant par l'intermédiaire d'un démultiplicateur (13) fait tourner le marteau à va-et-vient (2) et par conséquent le trépan (1). Le trépan (1) peut ainsi forer un trou directionnel dans la roche dure sans faire tourner le train de tiges. Le mouvement d'entraînement rotatif du moteur (14) peut être couplé au marteau à va-et-vient (2) au moyen d'un amortisseur (10) et d'accouplements souples (9). L'enveloppe courbe (4) est soutenue dans le trou de sondage, pendant le forage directionnel, par un stabilisateur frontal (18) à patin de butée et par un stabilisateur arrière (19).

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