Oxidized guar for oilfield servicing fluids

Details Oxidized guar for oilfield servicing fluids Oxidized guar for oilfield servicing fluids

C - Chemistry, Metallurgy

09

K

C09K 8/60 (2006.01) C09K 8/68 (2006.01)

Patent

CA 2652091

An oilfield servicing fluid composition containing an aldehyde guar produced by enzymatic oxidation of a .pi.on-derivatized, straight guar or of a guar derivative. The enzyme used to oxidize the guar to the aldehyde guar is galactose oxidase, which may be combined with catalase or catalase and peroxidase. The aldehyde guar is useful as an effective gelling agent for oilfield servicing fluids such as hydraulic fracturing fluids and stimulation fluids.

La présente invention concerne une composition de fluide d'entretien de champs pétrolifères contenant un aldéhyde de guar produit par oxydation enzymatique d'un guar droit non dérivé ou d'un dérivé de guar. L'enzyme utilisée pour oxyder le guar et obtenir l'aldéhyde de guar est l'oxydase de galactose, celle-ci pouvant être combinée avec de la catalase ou bien de la catalase et de la peroxydase. L'aldéhyde de guar est utile en tant que gélifiant efficace pour les fluides d'entretien de champs pétrolifères, tels que les boues de fracturation hydrauliques et les fluides de stimulation.

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