Polymer enhanced foam workover, completion, and kill fluids

Details Polymer enhanced foam workover, completion, and kill fluids Polymer enhanced foam workover, completion, and kill fluids

E - Fixed Constructions

21

B

E21B 43/00 (2006.01) C09K 8/50 (2006.01) C09K 8/94 (2006.01) E21B 21/00 (2006.01) E21B 33/13 (2006.01)

Patent

CA 2234173

Polymer enhanced foam fluid is utilized for completion, workover, and kill operations in wells penetrating subterranean formations. The foam is formed by appropriately adding a gas to an aqueous solution of a substantially noncrosslinked water-soluble polymer and a surfactant. The solution and the foam are substantially free of crosslinking agents. The foam may be generated at the surface or in a wellbore.

On utilise un fluide formé de mousse enrichie en polymère pour effectuer des opérations de conditionnement, de reconditionnement et d'arrêt définitif de puits dans des puits pénétrant dans des formations souterraines. Pour produire la mousse on ajoute de manière appropriée un gaz dans une solution aqueuse constituée d'un polymère soluble dans l'eau sensiblement non réticulé et d'un tensio-actif. La solution et la mousse sont sensiblement dépouvues d'agents de réticultaion. La mousse peut être produite à la surface ou dans un puit de forage.

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