Self adaptive cement systems

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/42 (2006.01) C04B 28/00 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2524977

A self-adaptive cement system includes cement, water and at least one additive that reacts or and expands in contact with oil and gas. Several chemical products have been identified including rubber alkylstyrene, polynorbornene, resins such precrosslinked substituted vinyl acrylate copolymers and diatomaceous earth. These additives have the effect of making the cement self- healing in the event of physical failure or damage such as micro-annuli. The self healing property is produced by the contact with subterranean hydrocarbon fluids, the potential repair mechanism is thus activated if and when needed in case of start of loss of zonal isolation. In another embodiment, the expansion is deliberately induced by pumping a hydrocarbon fluid in the vicinity of the set cement.

La présente invention a trait à un système de ciment auto-adaptatif comportant du ciment, de l'eau et au moins un additif qui réagit ou se dilate au contact du pétrole ou du gaz. On a identifié divers produits chimiques comprenant du caoutchouc alkylstyrène, du polynorbonène, des résines telles que des copolymères vinylacryliques et la terre à diatomées. Ces additifs ont pour effet de rendre le ciment autorégénérant dans le cas d'une défaillance physique ou d'endommagement tels que des déformations de type microanneaux. La propriété d'autorégénération est produite par le contact avec des fluides hydrocarbonés souterrains, le mécanisme de réparation potentiel est ainsi activé si ou quand c'est nécessaire dans le cas d'un début de perte d'isolement de zone. Dans un autre mode de réalisation, la dilatation est induite de manière délibérée par le pompage d'un fluide hydrocarboné dans le voisinage du ciment séché.

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