Crosslinked polymer fluids and crosslinking concentrates...

E - Fixed Constructions – 21 – B

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E21B 43/267 (2006.01) C08J 3/24 (2006.01) C08K 3/10 (2006.01) C09K 8/62 (2006.01) C09K 8/68 (2006.01)

Patent

CA 2416718

Disclosed is a concentrate composition for crosslinking polysaccharide polymers hydrated in an aqueous liquid, and well servicing fluids, preferably fracturing fluids, prepared therewith. Preferred polysaccharide polymers are galactomannan gums or derivatives thereof, preferably hydroxypropylguar. The concentrate comprises an alkali metal formate solution, preferably potassium formate, a crosslinking agent for the polysaccharide polymer, preferably a sparingly soluble alkali metal or alkali metal alkaline earth metal borate, and a suspension agent, preferably a clay mineral selected from the group consisting of smectite clays, palygorskite clays, and mixtures thereof. Exemplary clays are hectorite, sepiolite, and attapulgite. The concentrate may, optionally, contain a deflocculant and/or an anti-syneresis additive.

Divulgation d'une composition de concentré pour réticulation de polymères de polysaccharide hydratés dans un liquide aqueux et des fluides de service pour puits, de préférence des fluides de fracturation, préparées aum moyen de cette composition. Les polymères de polysaccharide préférés sont des gommes de galactomannane ou des dérivés de celles-ci, de préférence de l'hydroxypropylguar. Le concentré comprend une solution de formate de métal alcalin, de préférence du formate de potassium, un agent de réticulation pour le polymère de polysaccharide, de préférence un borate de métal alcalino-terreux ou de métal alcalin peu soluble, et un agent stabilisateur, de préférence un minéral argileux choisi parmi le groupe constitué des argiles smectiques, des argiles à attapulgite et des mélanges de celles-ci. Les argiles de choix sont l'hectorite, la sépiolite et l'attapulgite. Le concentré peut, au besoin, contenir un défloculant et/ou un additif anti-synérèse.

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