A method of using a swelling agent to prevent a cement...

E - Fixed Constructions – 21 – B

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E21B 33/138 (2006.01) C09K 8/40 (2006.01) C09K 8/512 (2006.01) C09K 8/514 (2006.01) E21B 33/14 (2006.01)

Patent

CA 2517063

Methods of cementing in a subterranean formation include passing a swelling agent to a permeable zone in a subterranean formation. The swelling agent is combined with a carrier fluid before being passed to the permeable zone. Upon contacting an aqueous fluid, the swelling agent swells in the permeable zone. The aqueous fluid may already be present in the subterranean formation, or alternatively, it may be introduced to the subterranean formation after passing the swelling agent into the subterranean formation. The swelling agent substantially inhibits a cement slurry subsequently pumped into the subterranean formation from passing through the permeable zone. The cement slurry therefore continues flowing down through the casing and up through the annulus where it sets and forms a strong cement column.

Des procédés de cimentation dans une formation souterraine consistent à faire passer un agent gonflant dans une zone perméable située dans ladite formation. Cet agent gonflant est associé à un fluide porteur avant son passage dans la zone perméable. Lors du contact avec un fluide aqueux l'agent gonflant gonfle dans la zone perméable. Ce fluide aqueux peut déjà être présent dans la formation souterraine, ou encore, il peut y être introduit après le passage de l'agent gonflant dans la formation souterraine. L'agent gonflant empêche dans une large mesure un laitier de ciment injecté ultérieurement dans la formation souterraine de passer à travers la zone perméable. Le laitier de ciment continue donc à s'écouler vers le bas dans le cuvelage et vers le haut dans l'annulaire où il durcit et forme une colonne de ciment robuste.

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