E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/04 (2006.01) E21B 7/06 (2006.01) E21B 44/00 (2006.01)
Patent
CA 2568119
Aspects of this invention include a downhole tool (such as a steering tool) including first and second sensor sets for measuring substantially instantaneous drill string rotation rates. Each of the sensor sets includes at least one accelerometer disposed to measure cross-axial acceleration components. Embodiments of this invention advantageously enable gravitational and tool shock/vibration acceleration components to be cancelled out, thereby improving accuracy. Moreover, exemplary embodiments of this enable stick/slip conditions to be detected and accommodated.
Cette invention concerne, entre autres aspects, un outil de fond (par exemple, un outil de direction), qui comprend des séries de premiers et seconds capteurs pour mesurer les vitesses de rotation presque instantanée des rames de forage. Chaque série de capteurs comprend au moins un accéléromètre conçu pour mesurer les composantes de l'accélération transaxiale. Ces innovations ont pour avantage de permettre la neutralisation des composantes de l'accélération des chocs et des vibrations transmis par les outils, et d'améliorer ainsi la précision des opérations. En outre, ces techniques modèles permettent de détecter et de corriger les conditions propices aux grippages et aux dérapages.
Borden Ladner Gervais Llp
Pathfinder Energy Services Inc.
Smith International Inc.
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