Downhole drilling assembly

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/10 (2006.01) E21B 10/26 (2006.01)

Patent

CA 2756010

A downhole stabiliser (5), such as a drill motor stabiliser, comprises at least one reaming means and/or reinforcing means (10). The present invention also relates to an assembly (30), such as a downhole drilling assembly (31), comprising at least one such stabiliser (5) and/or a drill bit (40,41) comprising a gauge bit (42) at or near a drilling end (45) thereof, and a connection means (46) for connecting the drill bit (40,41) to a drill motor assembly (60), wherein the drill bit gauge (42) comprises a substan-tially cylindrical portion having a length less than or equal to approximately 1.0 times the nominal bit diameter. The present in-vention also relates to a novel locking mechanism (80), such as a lock and key mechanism, to allow locking of a shaft (70'), e.g. a motor drive shaft (71'), through or together with a stabiliser (5').

L'invention concerne un stabilisateur (5) de fond, tel qu'un stabilisateur de moteur de forage, comportant au moins un moyen d'alésage et / ou un moyen (10) de renfort. La présente invention concerne également un ensemble (30), par exemple un ensemble (31) de forage de fond, comportant au moins un tel stabilisateur (5) et / ou un trépan (40,41) comportant une jauge (42) de trépan au niveau ou à proximité d'une extrémité (45) de forage de celui-ci, ainsi qu'un moyen (46) de raccordement destiné à raccorder le trépan (40, 41) à un ensemble moteur (60) de forage, la jauge (42) de trépan comportant une partie sensiblement cylindrique de longueur inférieure ou égale à environ 1,0 fois le diamètre nominal du trépan. La présente invention concerne également un mécanisme (80) de blocage innovant, tel qu'un mécanisme de type « serrure et clé », permettant de bloquer un arbre (70'), par ex. un arbre (71') d'entraînement par moteur, par l'intermédiaire ou solidairement d'un stabilisateur (5').

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