Drilling compositions and methods

Details Drilling compositions and methods Drilling compositions and methods

C - Chemistry, Metallurgy

08

F

C08F 220/42 (2006.01) C09K 8/12 (2006.01) C09K 8/508 (2006.01) C09K 8/512 (2006.01) C09K 8/88 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2226070

The materials include non-polyampholite crosslinked polymers and gels based on a polymer which in uncrosslinked form is substantially soluble in ionic fluids and substantially insoluble in water. The materials change their state of hydration in response to an environmental trigger. The disclosed materials are useful as drilling, completion or workover fluids in wells such as hydrocarbon producing wells. According to the disclosed method, crosslinked polymers or gels are introduced into a stratum, blocking or bridging the pores of the stratum. Thereafter, an environmental condition is changed to cause the hydrated material to become less hydrated to unblock the pores allowing production from the well.

Les matériaux comprennent des polymères réticulés non polyampholytes et des gels à base d'un polymère qui, sous sa forme non réticulée, est pratiquement soluble dans les fluides ioniques et pratiquement insoluble dans l'eau. L'hydratation des matériaux se modifie en réponse à un déclencheur du milieu ambiant. Les matériaux selon l'invention s'avèrent utiles en tant que boues de forage et fluides de complétion dans les puits, notamment les puits de production d'hydrocarbures. Selon le mode de réalisation présenté, on introduit des polymères réticulés ou des gels dans une strate, ce qui a pour effet de bloquer et de recouvrir les pores de la strate. Après quoi, on modifie le milieu ambiant pour forcer les matériaux à se déshydrater dans une certaine mesure afin de débloquer les pores et de relancer la production du puits.

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