Hydrophilic polymer concentrates

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 8/035 (2006.01)

Patent

CA 2432442

Disclosed is a hydrophilic, water soluble polymer concentrate for addition to aqueous liquids to enhance the properties thereof, particularly to increase the viscosity or decrease the fluid loss of well drilling and servicing fluids, the concentrate comprising a hydrophobic, water insoluble liquid, an organophilic clay suspension agent, the water soluble polymer, and a stabilizing agent comprising one or more acids in an amount from about 0.001% to about 1.5%, one or more anionic surfactants in an amount from about 0.001 % to about 1.0%, one or more nonionic surfactants in an amount from 0.001% to about 0.625% and, from about 0% to about 0.75% of one or more water soluble organic liquids, wherein the total concentration of the stabilizing agent is from about 0.1% to about 2.5%, these percentages being based on the weight of the concentrate. Preferably the stabilizing agent is a microemulsion comprising the acid(s), the anionic surfactant(s), the nonionic surfactant(s), and the water soluble organic liquid(s), and further comprising from about 0.0005% to about 1.0% of one or more water insoluble solvents, and from about 0.001 % to about 2.0% water.

On présente un concentré polymérique hydrosoluble destiné à être ajouté à des solutions aqueuses afin d'en améliorer les propriétés, en particulier afin d'en accroître la viscosité ou de réduire les pertes de fluides pendant le forage de puits et les pertes de fluides d'entretien; le concentré renferme un liquide hydrophobe insoluble dans l'eau, un agent de suspension organophile à base d'argile, le polymère hydrosoluble et un agent de stabilisation renfermant au moins un acide en concentration d'environ 0,001 % à environ 1,5 %, au moins un surfactant anionique en concentration d'environ 0,001 % à environ 1,0 %, au moins un surfactant non ionique en concentration d'environ 0,001 % à environ 0,625 %, et entre 0 % et environ 0,75 % d'au moins un liquide organique hydrosoluble, où la concentration totale de l'agent de stabilisation se situe entre environ 0,1 % et environ 2,5 %, ces pourcentages étant fondés sur le poids du concentré. Idéalement, l'agent de stabilisation est une microémulsion comprenant le(s) acide(s), le(s) surfactant(s) anionique(s), le(s) surfactant(s) non ionique(s) et le(s) liquide(s) organique(s) hydrosoluble(s), en plus d'une fraction d'environ 0,0005 % à environ 1,0 % d'au moins un solvant insoluble dans l'eau, et d'une fraction d'environ 0,001 % à environ 2,0 % d'eau.

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