E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/06 (2006.01)
Patent
CA 2539097
A drilling system includes a steerable bottOmhole assembly (BHA) having a steering unit and a control unit that provide dynamic control of drill bit orientation or tilt. Exemplary steering units can adjust bit orientation at a rate that approaches or exceeds the rotational speed of the drill string or drill bit, can include a dynamically adjustable articulated joint having a plurality of elements that deform in response to an excitation signal, can include adjustable independently rotatable rings for selectively tilting the bit, and/or can include a plurality of selectively extensible force pads. The force pads are actuated by a shape change material that deforms in response to an excitation signal. A method of directional drilling includes continuously cycling the position of the steering unit based upon the rotational speed of the drill string and/or drill bit and with reference to an external reference point.
L'invention concerne un système de forage comprenant un ensemble de fond guidé comportant une unité de guidage et une unité de commande permettant de commander dynamiquement l'orientation ou l'inclinaison du trépan. Les unités de guidage utilisées peuvent régler l'orientation du trépan à une vitesse proche ou supérieure à la vitesse de rotation du train de tiges ou du trépan, peuvent comprendre des bagues réglables indépendantes, rotatives, conçues pour incliner sélectivement le trépan, et/ou peuvent comprendre une pluralité de garnitures extensibles de manière sélective. Ces garnitures sont actionnées par un matériau souple qui se déforme en réponse à un signal d'excitation. Un procédé de forage directionnel consiste à mesurer la position de l'unité de guidage en continu, sur la base de la vitesse de rotation du train de tiges et/ou du trépan par rapport à un point de référence externe.
Aronstam Peter S.
Fincher Roger W.
Watkins Larry A.
Baker Hughes Incorporated
Sim & Mcburney
LandOfFree
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