A method and an apparatus for production testing involving...

E - Fixed Constructions – 21 – B

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E21B 49/00 (2006.01)

Patent

CA 2287285

When production testing a permeable first formation (4), fluid flowing out therefrom is subjected to a pressure measurement and a flow rate control. In order to avoid bringing up the fluid flowing out during the production test to surface position where the fluid's inherent explosion and fire risk as well as poisonousness would cause substantial problems, a fluid flow path arranged for fluid transfer between the formations (4, 6) is established between said first formation (4) to be production tested and a second permeable formation (6), said fluid flow path which, in a suitable apparatus, is constituted by a channel- forming pipe (8). From this channel second permeable formation (6) receives said fluid and keeps it for some time. In the position of use, the apparatus is assigned sealing means, i.a. annulus packers (10, 11, 12) which are placed such that fluid flow between the formations (4, 6) is limited to only follow said fluid flow path.

Lors d'un essai de production d'une première formation perméable (4), un fluide s'écoulant à partir de cette formation est soumis à une mesure de pression et à une commande de vitesse d'écoulement. Lors de l'essai de production, afin d'éviter d'avoir à fournir le fluide circulant hors de la formation pour se diriger sur une position de surface dans laquelle des risques inhérents au fluide, d'explosion et d'incendie de même que d'empoisonnement, provoqueraient de sérieux problèmes, on a établi un trajet d'écoulement fluidique, conçu pour le transfert du fluide entre les formations (4, 6), entre ladite première formation (4) à essayer et une seconde formation perméable (6), ce trajet, dans un dispositif approprié, étant constitué par un tuyau formant une canalisation (8). La seconde formation perméable (6) reçoit le fluide à partir de cette canalisation et le conserve pendant une certaine période. Dans sa position d'utilisation, le dispositif est doté de moyens d'étanchéité, à savoir des garnitures d'étanchéité annulaires (10, 11, 12), placées de telle manière que l'écoulement du fluide entre les formations (4, 6) soit limité et ne puisse que suivre ledit trajet d'écoulement.

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