Polyvalent metal ion chelating agents for xanthan solutions

Details Polyvalent metal ion chelating agents for xanthan solutions Polyvalent metal ion chelating agents for xanthan solutions

E - Fixed Constructions

21

B

31/26

E21B 43/22 (2006.01) C08K 5/09 (2006.01) C09K 8/90 (2006.01)

Patent

CA 1181938

Polyvalent Metal Ion Chelating Agents for Xanthan Solutions Abstract A stable xanthan solution with superior filterability characteristics comprising biopolymer and a chelating agent selected from aliphatic alpha-hydroxy acids having from about 2-7 carbon atoms; aliphatic and aromatic beta-keto compounds having from about 4-9 carbon atoms; or 2- and 4- pyrones having a hydroxyl group alpha to the carbonyl and having 5 or 6 carbon atoms; said chelating agent being present in an amount of at least about 1.0 ppm of the total solution. A method of enhancing oil recovery comprising employing as a mobility control solution in oil-bearing formations a mixture of xanthan biopolymer and a chelating agent is also disclosed.

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