A method for pressure- and flow-preventive fixing of pipes...

E - Fixed Constructions – 21 – B

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E21B 33/14 (2006.01)

Patent

CA 2443172

A method for pressure- and flow-prevetive fixing of well pipes, preferably liners and casings (14, 54, 60, 66) in a well when drilling the well, wherein the method also may be used in a completed well in order to place a pressure- and flow-preventive barrier in an annulus (16) surrounded by at least one leaking well pipe. The method comprises the use of granular particles of unconsolidated matter which, by means of their particle sorting, are arranged with a suitably small permeability, and wherein the particles of unconsolidated matter thereafter are mixed with water and potential other additives to become a fluidised mixture of unconsolidated matter (22) subsequently being placed, preferably by pumping, as a pressure- and flow- preventive barrier of unconsolidated matter (38, 56, 62, 68) in the pertinent annulus (16). The barrier of unconsolidated matter (38, 56, 62, 68) is placed in the annulus (16) in such a way that inflowing fluids are brought into contact with, and are prevented from flowing by, the barrier of unconsolidated matter (38, 56, 62, 68) which, owing to the method, thus also is arranged with a suitably small permeability.

Procédé de fixation de tuyaux de forage dans un puits, de préférence colonnes perdues et tubages (14, 54, 60, 66), visant à limiter la pression et le débit de ceux-ci pendant le forage du puits. Le procédé peut aussi être utilisé dans un puits complètement équipé pour mettre en place une barrière limitant la pression et le débit dans un espace annulaire (16) entouré par au moins un tuyau de forage qui fuit. Le procédé comprend l'utilisation de particules granulaires de matières non consolidées qui sont aménagées, par un tri desdites particules, de façon à présenter une perméabilité suffisamment faible ; ces particules de matières non consolidées sont ensuite mélangées à de l'eau et à d'autres additifs potentiels pour former un mélange fluidisé de matières (22) non consolidées destiné à être mis en place ultérieurement, de préférence par pompage, comme barrière constituée de matières non consolidées (38, 56, 62, 68) limitant la pression et le débit dans l'espace annulaire (16) concerné. La barrière de matières non consolidées (38, 56, 62, 68) est mise en place dans l'espace annulaire (16) de sorte que les fluides entrants sont amenés en contact avec celle-ci (38, 56, 62, 68) et empêchés de s'écouler, cette barrière présentant, selon le procédé, une perméabilité suffisamment faible.

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