Steerable drilling with downhole motor

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/06 (2006.01)

Patent

CA 2207923

A method is provided for creating a borehole in an earth formation using a drilling assembly comprising a drill string (5) extending into the borehole, a downhole motor (6) including a housing (7) and a drive shaft (8) for rotating a drill bit (9), which drive shaft has an inclined orientation relative to a longitudinal axis of the lower part of the drill string. The motor housing is connected to the lower part of the drill string in a manner so as to allow rotation of the motor housing about said longitudinal axis. The drilling assembly further comprises an electric motor (23) for rotation of the motor housing about said longitudinal axis and relative to the drill string. The method comprises drilling a substantially straight section of said borehole by inducing said electric motor to rotate the motor housing continuously about said longitudinal axis and relative to the drill string while the downhole motor is operated to rotate the drill bit.

Procédé permettant de produire un puits de forage dans une formation terrestre au moyen d'un ensemble de forage comprenant une garniture de forage (5) s'étendant dans le puits et un moteur de fond de puits (6) doté d'un carter (7) et d'un arbre d'entraînement (8) mettant en rotation le trépan de forage (9), ledit arbre d'entraînement étant incliné par rapport à l'axe longitudinal de la partie inférieure de la garniture de forage. Le carter du moteur est accouplé à la partie inférieure de la garniture de forage de sorte qu'il puisse tourner autour dudit axe longitudinal. L'ensemble de forage comprend en outre un moyen de commande (23) destiné à commander la rotation du carter du moteur autour dudit axe longitudinal et par rapport à la garniture de forage. Ce procédé consiste à effectuer le forage d'une partie pratiquement droite du puits par la mise en rotation, par le moteur électrique, du carter du moteur de manière continue autour dudit axe longitudinal et par rapport à la garniture de forage, tandis que le moteur de fond de puits est actionné de façon à faire tourner le trépan de forage.

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