Communication system for down hole use

E - Fixed Constructions – 21 – B

Patent

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E21B 17/00 (2006.01) E21B 47/12 (2006.01) E21B 47/18 (2006.01)

Patent

CA 2506808

A communication system for down hole use and comprising a drill collar (101) comprising a first portion (103) and a second portion (105) separated from each other by an electrically insulating material (67) and means (22, 63, 77, 81) for generating an electrical signal and for applying the electrical signal to the drill collar (101) such that the electrical signal is transmitted into a geological formation being drilled, characterised in that the means for generating the electrical signal comprises an alternator (22, 63, 77, 81) and means (2, 4, 10) responsive to an electrical output of the alternator for regulating rotation of the alternator.

L'invention concerne un système de communication destiné à être utilisé au fond d'un puits de forage, comprenant une masse-tige (101) constituée d'une première partie (103) et d'une deuxième partie (105) séparées l'une de l'autre par un matériau électro-isolant (67) et des moyens (22, 63, 77, 81) servant à générer un signal électrique et à appliquer ce signal électrique sur la masse-tige (101), de façon que le signal électrique soit transmis à une formation géologique en cours de forage. Cette invention est caractérisée en ce que le moyen servant à générer un signal électrique comprend un alternateur (22, 63, 77, 81), ainsi que des moyens (2, 4, 10) qui sont sensibles à une sortie électrique de l'alternateur et servent à réguler les mouvements de rotation de cet alternateur.

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