Fluid displacement with heteropolysaccharide solutions, and...

Details Fluid displacement with heteropolysaccharide solutions, and... Fluid displacement with heteropolysaccharide solutions, and...

C - Chemistry, Metallurgy

12

P

195/140, 31/26,

C12P 19/04 (2006.01) C08B 37/00 (2006.01) C09K 8/035 (2006.01) C09K 8/90 (2006.01) E21B 43/22 (2006.01)

Patent

CA 1173771

ABSTRACT A process for displacing a fluid through a well and/or a permeable subsurface formation communicating with the well, by injecting into the well an aqueous solution which contains, as viscosifier, a heteropolysaccharide comprising glucose and, for each 7 moles of glucose, 0.9-1.2 moles of galactose and 0.65 to 1.1 moles of pyruvate, together with succinate and acetate in molar proportions (based on 7 moles of glucose) between 0 and 2. The heteropolysaccharide is suitably obtained by cultivation of a slime-forming species of Pseudomonas, Rhizobium, Alcaligenes or Agrobacterium, in particular Pseudomonas NCIB 11592.

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