E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/00 (2006.01) E21B 7/20 (2006.01) E21B 17/14 (2006.01)
Patent
CA 2318500
An overburden drilling device includes a drill bit body, a percussion element for applying impacts to the body, and a casing attached to the body. The casing is connected to the drill bit body by a casing shoe. The casing shoe and the drill bit body are interconnected by radially overlapping walls so that the drill bit body pulls the casing along during a drilling operation while rotating relative thereto. A wedge-shaped member is provided around the casing close to a rear end of the casing shoe so as to facilitate removal of the drilling equipment from a bore.
L'invention concerne un équipement de forage de morts-terrains comprenant un corps trépan, un élément à percussion destiné à appliquer des impacts sur le corps, et une enveloppe fixée au corps. L'enveloppe est reliée au corps trépan par un sabot de guidage. Le sabot de guidage et le corps trépan sont interconnectés par des parois à chevauchement radial de telle façon que le corps trépan tire l'enveloppe lors d'une opération de forage tout en tournant par rapport à elle. Un élément en biseau est placé autour de l'enveloppe à proximité de l'extrémité postérieure du sabot de guidage de manière à permettre d'enlever facilement l'équipement de forage du trou de forage.
Gowling Lafleur Henderson Llp
Sandvik Ab
LandOfFree
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