E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/26
E21B 43/22 (2006.01) C08J 3/09 (2006.01) C08L 5/00 (2006.01) C09K 8/32 (2006.01) C09K 8/588 (2006.01) C09K 8/90 (2006.01)
Patent
CA 1239014
ABSTRACT POLYMER SUSPENSIONS Polysaccharide is provided as a fluid composition that is a dispersion of the polysaccharide in oil and that contains a dispersion promoter selected from surfactants and stabilisers. The dispersion is generally a stable flocculated dispersion. It is generally made by dispersing an aqueous polysaccharide solution having a consistency index of about 20,000 cps in oil in the presence of dispersion promoter and then drying the dispersion. The oil generally comprises volatile and non-volatile components such that the drying can be by azeotroping. The dispersion promoters are generally selected from amphiphatic copolymers and surfactants having HLB at 20°C above 6.5 but which serve as water in oil dispersing agents during the formation of the dispersion. Aqueous solutions of the polysaccharide can be made by dispersing the fluid composition in water. These aqueous solutions are of particular value in methods of enhanced oil recovery.
454320
Flesher Peter
Langley John
Symes Ken C.
Allied Colloids Limited
Borden Ladner Gervais Llp
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