Internal breaker for oilfield treatments

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/25 (2006.01) C09K 8/514 (2006.01) C09K 8/575 (2006.01) C09K 8/68 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2662210

A composition and method for improving the fluid efficiency of many oilfield treatments is given. The composition is a solid additive, in a viscosified fluid, in a size range small enough that it enters formation pores; it optionally bridges there to form an internal filter cake, and then decomposes to provide a breaker for the viscosifying system for the fluid. Examples of suitable additives include waxes, polyesters, polycarbonates, polyacetals, polymelamines, polyvinyl chlorides, and polyvinyl acetates. Degradation of the additive may be accelerated or delayed.

La présente invention concerne une composition et un procédé destinés à améliorer l'efficacité fluide de nombreux traitements de champs pétrolifères. La composition est un additif solide, dans un fluide rendu visqueux, dans une gamme de taille suffisamment petite pour qu'elle pénètre des pores de formation; elle y effectue éventuellement un pont pour former un gâteau de filtration interne puis se décompose pour fournir un séparateur pour le système d'amélioration de la viscosité pour le fluide. Des exemples d'additifs appropriés comprennent les cires, polyesters, polycarbonates, polyacétals, polymélamines, chlorures de polyvinyle et acétates de polyvinyle. La dégradation de l'additif peut être accélérée ou retardée.

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