Dual bha drilling system

E - Fixed Constructions – 21 – B

Patent

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E21B 7/08 (2006.01)

Patent

CA 2697912

The invention relates to apparatus and methods useful for drilling lateral boreholes into a formation surrounding a main borehole. Proposed technique can be used for drilling of laterals which does not require such significant interruptions to deploy the small BHA and is based on the use of a drilling apparatus, comprising a drill collar forming part of a primary drilling assembly and having an outward opening groove in the side thereof, a secondary drilling assembly, comprising a tubular drill string connected at one end to the drill collar, a drilling motor mounted in the drill string, a drill bit mounted at the other end of the drill string and connected to the drilling motor, wherein the secondary drilling assembly is mounted in the drill collar so as to be movable between a first position in which the drill bit is seated in the groove, and a second position in which the bit projects laterally from the groove in the side of the drill collar.

L'invention concerner un appareil et des procédés utiles pour forer des trous de forage latéraux dans une formation entourant un trou de forage principal. La technique proposée peut être utilisée pour le forage de trous latéraux qui ne nécessite pas d'interruptions majeures pour le déploiement du petit ensemble de fond de puits, et est basée sur l'utilisation d'un appareil de forage, comprenant une masse-tige faisant partie d'un ensemble de forage primaire et comportant une rainure d'ouverture vers l'extérieur dans le côté de celui-ci, un ensemble de forage secondaire, comprenant un train de tiges tubulaire relié au niveau d'une extrémité à la masse-tige, un moteur de forage monté dans le train de tiges, un trépan monté à l'autre extrémité du train de tiges et relié au moteur de forage, l'ensemble de forage secondaire étant monté dans la masse-tige de façon à pouvoir se déplacer entre une première position dans laquelle le trépan est rentré dans la rainure, et une seconde position dans laquelle le trépan dépasse latéralement de la rainure dans le côté de la masse-tige.

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