Method for the circulation of gas when drilling or working a...

E - Fixed Constructions – 21 – B

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E21B 21/16 (2006.01)

Patent

CA 2489968

A method for the circulation of gas when drilling or working a well. The method includes the step of pressurizing at least two chambers of a multi-chambered accumulator with inert gas. The chambers of the multi-chambered accumulator are operatively connected to one another and individually or in combination isolatable from each other. The method also includes isolating at least one chamber of the accumulator that has been pressurized with inert gas such that during drilling or working the well the isolated chamber remains pressurized with gas that has not been mixed with well gas returns. Pressurized gas is extracted from one or more of the non-isolated chambers of the accumulator and injected into the well. At least a portion of the gas returns from the well is collected, compressed and delivered to at least one of the non- isolated chambers of the multi-chamber accumulator.

Une méthode permettant la circulation du gaz pendant le forage ou le travail sur un puits. La méthode comprend l'étape de mettre en pression au moins deux chambres d'un accumulateur à plusieurs chambres avec du gaz inerte. Les chambres de l'accumulateur à plusieurs chambres sont opérationnellement reliées l'une à l'autre et individuellement ou en combinaison pouvant être isolée l'une de l'autre. La méthode comprend également l'isolement d'au moins une chambre de l'accumulateur ayant été mise en pression avec du gaz inerte tel que pendant le forage ou le travail, la chambre isolée demeure sous pression avec le gaz qui n'a pas été mélangé aux retours de gaz du puits. Du gaz sous pression est extrait d'une ou de plusieurs chambres non isolées de l'accumulateur et injecté dans le puits. Au moins une portion des retours de gaz du puits est recueillie, comprimée et livrée à au moins une des chambres non isolées de l'accumulateur à plusieurs chambres.

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