Device for extracting at least one type of gas contained in...

E - Fixed Constructions – 21 – B

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E21B 21/06 (2006.01) E21B 49/00 (2006.01)

Patent

CA 2606415

A device (53) comprises an enclosure (63) and means (65, 67) for circulating a drilling mud in the enclosure (63). The inventive device is also provided with means (69) for introducing a gas carrier into the enclosure (63), which comprises a pipe (113) provided with a unit (121) for adjusting the gas carrier flowrate. The device (53) comprises a gas extracting pipe (71) open into the enclosure (63). The gas introducing means (69) comprise a sensor (123) for measuring a pressure at a point located downstream of the adjusting unit (121) and means (117) for controlling the flowrate of the gas carrier injected through said adjusting unit (121) according to the difference between a pressure measured by the sensor (123) and a determined gas extraction pressure.

Ce dispositif (53) comprend une enceinte (63) et des moyens (65, 67) de circulation de la boue de forage dans l'enceinte (63). Il comprend en outre des moyens (69) d'introduction d'un gaz vecteur dans l'enceinte (63), comportant une conduite (113) munie d'un organe (121) de réglage du débit de gaz vecteur. Le dispositif (53) comprend une conduite (71) d'extraction de gaz débouchant dans l'enceinte (63). Les moyens d'introduction (69) de gaz vecteur comprennent un capteur (123) de mesure de la pression qui règne en un point situé en aval de l'organe de réglage (121), et des moyens (117) de commande du débit de gaz vecteur injecté à travers cet organe de réglage (121) en fonction de la différence entre la pression mesurée par le capteur (123) et une pression d'extraction de gaz déterminée.

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