Polymer mixtures for crosslinked fluids

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 8/68 (2006.01) C09K 8/575 (2006.01) E21B 43/04 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2621598

Treatment fluids comprising gelling agents that comprise crosslinkable polymers and certain biopolymers, and methods of use in subterranean operations, are provided. In one embodiment, the present invention provides a method of treating a portion of a subterranean formation comprising: providing a treatment fluid that comprises an aqueous base fluid, a crosslinking agent, and a gelling agent comprising a polymer that is a crosslinkable polymer, and a polymer that is a biopolymer wherein a molecule of the biopolymer (1) consists only of glucose, or (2) has a backbone comprising one or more units that comprise at least (a) one glucose unit and (b) one linear or cyclic pyranose-type monosaccharide unit, wherein (a) and (b) have different molecular structures; and introducing the treatment fluid into a well bore penetrating the subterranean formation.

La présente invention concerne des fluides de traitement comportant des gélifiants à base de polymères réticulables et autres biopolymères. L'invention concerne également des procédés destinés à des interventions souterraines. Un mode de réalisation de l'invention concerne un procédé permettant de traiter une partie d'une formation souterraine. En l'occurrence, on prend un fluide de traitement comprenant un fluide de base aqueux, un réticulant, et un gélifiant fait de deux polymère, l'un étant réticulable, et l'autre étant biopolymère. En outre, une molécule du biopolymère (1) est uniquement glucose, ou (2) comporte une ossature comprenant une ou plusieurs unités comprenant au moins (a) une unité glucose et (b) une unité monosaccharide, linéaire ou cyclique, de type pyranose, les unités (a) et (b) étant de structures moléculaires différentes. On introduit ensuite ce fluide de traitement dans un trou foré pénétrant la formation souterraine.

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