Pfizer Corporation

William C Wernau

James W Miller

Donald Beck

Thomas B Young, Iii

Biopolymers comprising xanthomonas and methylene bis (thiocyanate) are disclosed.

Biopolymer compositions having enhanced filterability

A mutant strain of the genus Xanthomonas produces a pyruvate-free biopolymer. This biopolymer and the deacetylated form of this new biopolymer provide mobility control solutions which are especially useful for enhanced oil recovery where high brine applications are involved. The mobility control solutions of the present invention may be made from whole or filtered fermentation broth containing the pyrvuate-free biopolymer or its deacetylated form. Alternatively, the biopolymer or its deacetylated form may be recovered from the broth and the recovered product used to form the desired mobility control solutions.

Xanthomonas biopolymer for use in displacement of oil from partially

A mutant strain of the genus Xanthomonas produces a pyruvate-free biopolymer. This biopolymer and the deacetylated form of this new biopolymer provide mobility control solutions which are especially useful for enhanced oil recovery where high brine applications are involved. The mobility control solutions of the present invention may be made from whole or filtered fermentation broth containing the pyruvate-free biopolymer or its deacetylated form. Alternatively, the biopolymer or its deacetylated form may be recovered from the broth and the recovered product used to form the desired mobility control solutions.

Xanthomonas bipolymer for use in displacement of oil from partially

Increased xanthan concentrations are obtained in Xanthomonas fermentations by the gradual addition of a source of assimilable carbon, preferably glucose, to the aqueous nitrient medium during the course of the fermentation cycle.

Fermentation process for production of xanthan

A process is disclosed for preparing a Xanthomonas colloid-containing fermentation broth suitable for the preparation of mobility control solution used in oil recovery which comprises aerobically fermenting a Xanthomonas organism in an aqueous nutrient medium whose ingredients comprise a carbohydrate, a nitrogen source, an assimilable Krebs cycle acid, chelated calcium and trace elements, whereby the whole broth produced provides mobility control solutions of about 100 to 3000 ppm of Xanthomonas colloid which are substantially free of insoluble matter having a particle size greater than about 3 microns.

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Groton, CT, United States of America

William C Wernau