Self adaptive cement systems

E - Fixed Constructions – 21 – B

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E21B 33/13 (2006.01) C04B 28/00 (2006.01)

Patent

CA 2524514

A self-healing cement system includes cement, water and at least one additive that swells in contact with water from reservoir or from formation in the case of a structural failure in the set cement to provide a physical barrier in the zone of failure. Examples of such material include particles of super- absorbent polymer. 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 of the water itself, the potential repair mechanism is thus activated if and when needed in case of start of loss of zonal isolation. Several super-absorbent polymers have been identified such as polyacrylamide, modified crosslinked poly(meth)acrylate and non-solute acrylic polymers.

La présente invention a trait à un système de ciment autorégénérant comportant du ciment, de l'eau et au moins un additif qui se gonfle au contact de l'eau en provenance d'un réservoir ou d'une formation dans le cas d'une défaillance de structure dans le ciment séché pour assurer une barrière physique dans la zone de défaillance. Des exemples d'un tel matériau comprennent des particules de polymère super absorbant. Ces additifs ont un pour effet de rendre le ciment autorégénérant dans le cas d'un défaut et d'endommagement tel que des déformations de type microanneaux. La propriété d'autorégénération est produite par le contact de l'eau elle-même, 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. On a identifié plusieurs polymères super absorbants tels que le polyacrylamide, des polymères de poly(meth)acrylates réticulés modifiés et acryliques non solubles.

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