Apparatus and method with hydrocarbon swellable and water...

Details Apparatus and method with hydrocarbon swellable and water... Apparatus and method with hydrocarbon swellable and water...

E - Fixed Constructions

21

B

E21B 33/12 (2006.01)

Patent

CA 2690340

A swellable apparatus for filling a space in oil or gas tool such as a wellbore packer is described. The swellable apparatus comprise a hydrocarbon swellable body which swells on exposure to a hydrocarbon fluid, and at least one water swellable body which swells on exposure to a second fluid comprising water. The hydrocarbon swellable body is interposed between the aqueous fluid and the water swellable body and comprises at least one access pathway configured to permit the passage of water to the water swellable body. The pathway may be formed by perforation, or by incorporating an additive into the hydrocarbon material, such as a foaming agent or polyoctenamer. Embodiments of the invention comprise variations in cross-linking in the hydrocarbon swellable body.

L'invention concerne un appareil dilatable permettant de remplir un espace dans un outil utilisé dans l'industrie du pétrole ou du gaz, notamment une garniture d'étanchéité. Cet appareil comprend un corps se dilatant au contact d'hydrocarbures qui se dilate une fois exposé à un fluide d'hydrocarbures, et au moins un corps se dilatant au contact de l'eau qui se dilate une fois exposé à un second fluide comprenant de l'eau. Le corps se dilatant au contact d'hydrocarbures est intercalé entre le fluide aqueux et le corps se dilatant au contact de l'eau, et comprend au moins une voie d'accès conçue pour permettre le passage de l'eau jusqu'au corps se dilatant au contact de l'eau. Cette voie d'accès peut être formée par perforation, ou par incorporation d'un additif dans la matière d'hydrocarbures, de sorte à former un agent moussant ou un polyocténamère. Des modes de réalisation de l'invention comprennent des variations au niveau de la réticulation du corps se dilatant au contact d'hydrocarbures.

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