E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/26 (2006.01) E21B 10/08 (2006.01) E21B 10/62 (2006.01)
Patent
CA 2387568
A rotary drill bit for drilling a borehole into an earth formation is provided. The drill bit comprises a drill bit body provided with means for connecting the drill bit to a drill string, the drill bit hav-ing a longitudinal axis of rotation during drilling with the drill string and the drill bit connected thereto, and a cutting member provided with cutting means at the outer surface thereof. The cutting member is ro-tatable relative to the bit body between a first rotational position and a second rotational position, wherein the cutting means is arranged at a larger radial distance from said longitudinal axis of rotation when the cutting member is in the second rotational position than when the cut-ting member is in the first rotational position.
La présente invention concerne un trépan rotatif permettant de forer un trou dans une formation terrestre. Ce trépan comprend un corps de trépan, pourvu de moyens permettant de connecter le trépan à un train de forage, le trépan présentant un axe de rotation longitudinal lors du forage avec le train de forage et le trépan qui lui est connecté, ainsi qu'un élément de coupe, pourvu de moyens de coupe à sa surface extérieure. L'élément de coupe peut tourner par rapport au corps de trépan, entre une première position de rotation et une seconde position de rotation, et est placé à une plus grande distance radiale dudit axe de rotation longitudinal lorsque l'élément de coupe se trouve dans la seconde position de rotation que lorsque l'élément de coupe se trouve dans la première position de rotation.
Abercrombie Simpson Neil Andrew
Betts Michael John
Harris Timothy William Rhys
Shell Canada Limited
Smart & Biggar
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