Enzymatic method for improving the injectability of...

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C - Chemistry, Metallurgy

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C12P 19/04 (2006.01) C08B 37/00 (2006.01) C09K 8/035 (2006.01) C09K 8/90 (2006.01) C12P 19/06 (2006.01) E21B 43/22 (2006.01)

Patent

CA 1139698

ENZYMATIC ? IMPROVEMENT ? OF POLYSACCHARIDES ABSTRACT OF THE DISCLOSURE A method for enhancing the ability of polysaccharides in aqueous solution to flow through a porous medium comprises contacting the poly- saccharides with an endoenzyme capable of hydrolyzing at least one of the linkages of the sugar units of the polysaccharides and maintaining the polysaccharides in contact with the enzyme under hydrolysis con- ditions for a time sufficient to decrease the tendency o the poly- saccharides to plug the porous medium yet insufficient to decrease the viscosity of the aqueous polysaccharides by more than 25%. The par- tially hydrolyzed polysaccharides are useful as thickening agents for flooding water used to mover oil from oil-containing subterranean formations.

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