A bottom-hole assembly, and a method and system for...

E - Fixed Constructions – 21 – B

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E21B 47/14 (2006.01) E21B 1/00 (2006.01) E21B 6/00 (2006.01)

Patent

CA 2724452

A bottom-hole assembly (202), BHA, for drilling a bore-hole (204, 301) in an earth formation (208, 300), comprising a percussion drill bit (208), a percussion mechanism adapted to strike the drill bit (208), at least one sensor (226, 228, 230, 232, 234) for measuring a physical quantity and converting it into an electrical signal, and converting means (237) for converting the electrical signal into a digital signal, and a method for transmitting data from such a bottom-hole assembly (202) positioned in a borehole (204, 301), the bottom-hole assembly (202) and the method being characterized by encoding the digital signal by controlling the percussion mechanism and time periods between two impacts delivered by the percussion mechanism on the drill bit (208) during drilling, and transmitting the encoded digital signal by waves generated by the impacts delivered by the percussion mechanism on the drill bit (208). A system which comprises said bottom-hole assembly (202).

L'invention porte sur un ensemble de fond de trou (202) (BHA), pour forer un trou de forage (204, 301) dans une formation terrestre (208, 300), incluant un trépan à percussion (208), un mécanisme de percussion apte à produire l'impact du trépan (208), au moins un capteur (226, 228, 230, 232, 234) pour mesurer une quantité physique et la convertir en un signal électrique, et des moyens de conversion (237) pour convertir le signal électrique en un signal numérique, et sur un procédé pour transmettre des données à partir d'un tel ensemble de fond de trou (202) positionné dans un trou de forage (204, 301). L'ensemble de fond de trou (202) et le procédé sont caractérisés par le codage du signal numérique par commande du mécanisme de percussion et de périodes de temps entre deux impacts délivrés par le mécanisme de percussion sur le trépan (208) durant le forage, et par la transmission du signal numérique codé au moyen d'ondes générées par les impacts délivrés par le mécanisme de percussion sur le trépan (208). L'invention porte également sur un système qui inclut ledit ensemble de fond de trou (202).

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