Methods of perforating and testing wells using coiled tubing

Details Methods of perforating and testing wells using coiled tubing Methods of perforating and testing wells using coiled tubing

E - Fixed Constructions

21

B

E21B 47/00 (2006.01) E21B 43/11 (2006.01) E21B 43/116 (2006.01) E21B 49/08 (2006.01)

Patent

CA 2105104

Methods of draw-down and build-up testing on existing production wells are disclosed. The testing may be accomplished without removing the production tubing string from the well. The production of the well is shut down and then a coiled tubing test string is run down into the production tubing string. The coiled tubing test string includes a coiled tubing string, a tester valve carried by the coiled tubing string, and a test packer carried by the coiled tubing string. The test packer is set within one of the casing bore and the production tubing bore above perforations which communicate the casing bore with a subsurface formation. Draw-down and build-up testing of the subsurface formation can then be accomplished by opening and closing the tester valve to selectively flow well fluid up through the coiled tubing string or shut in the coiled tubing string. After the draw-down/build-up testing is completed, the coiled tubing test string is removed from the well and production of the well is resumed up through the production tubing bore of the production tubing string. Optionally, the coiled tubing test string may carry a perforating gun to perforate a new zone of the well which may then be tested.

Présentation de méthodes d'essai de soutirage et de remontée de pression dans des puits existants. L'essai peut être réalisé sans retirer le train de tiges de production du puits. La production du puits est interrompue, et un tube d'intervention enroulé est descendu dans le train de tiges de production. L'essai par tube d'intervention enroulé nécessite un tube d'intervention enroulé, une soupape d'essai portée par le tube d'intervention enroulé, et un packer d'essai porté par le même tube. Le packer d'essai est placé dans l'un des alésages du cuvelage ou du tubage de production au-dessus de perforations qui font communiquer l'alésage du cuvelage avec une formation souterraine. Les essais de soutirage et de remontée de pression pour la formation souterraine peuvent être réalisés en ouvrant et en refermant la soupape d'essai pour permettre ou interrompre l'écoulement du fluide vers le haut par le tube d'intervention enroulé. Après l'essai de soutirage et de remontée de pression, le tube d'intervention enroulé est retiré du puits, et l'exploitation du puits reprend grâce à l'alésage du tubage de production du train de tiges de production. Au choix, le tube d'intervention enroulé d'essai peut porter un perforateur pour pratiquer des trous dans une nouvelle zone du puits en vue de réaliser d'autres essais.

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