E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/08 (2006.01) E21B 7/06 (2006.01) E21B 17/10 (2006.01)
Patent
CA 2367523
A rotary steerable system (10) for use in a drill string (9) for drilling a deviated well is disclosed. The system (10) utilizes a mechanical gravity reference device comprising an unbalanced weight (14) which may rotate independently of the rotation of the drill string (9) so that its heavy portion is always oriented toward the low side of the wellbore and which has an attached magnet (16). A magnetic switch (17) that rotates as the drill string (9) rotates is activated when its axis coincides with the axis of the magnet (16), and this activation results in a thrust member or pad (25) being actuated to "kick" the side of the wellbore.
L'invention porte sur un système (10) rotary orientable servant au forage de puits déviés et se plaçant sur le train (9) de tiges. Ledit système (10) recourt à un dispositif mécanique à référence gravitationnelle comportant une masse non équilibrée (14) pouvant tourner indépendamment de la rotation du train (9) de tiges de manière à ce que sa partie lourde à laquelle est fixé un aimant (16) soit toujours orientée vers le bas du puits. Un commutateur magnétique (17) tournant avec le train (9) de tiges est activé lorsque son axe coïncide avec celui de l'aimant (16), cette activation commandant un élément de poussée ou une plaquette (25) pour heurter la paroi latérale du puits.
Buytaert Jean
Marks & Clerk
Weatherford/lamb Inc.
LandOfFree
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