Sulfated biopolymers for use in recovering petroleum from a subt

Details Sulfated biopolymers for use in recovering petroleum from a subt Sulfated biopolymers for use in recovering petroleum from a subt

1979-11-26

1982-03-09

Guynn, Herbert B.

Compositions

Leather or fur treating

166246, 536114, E21B 4322

Patent

active

043188150

ABSTRACT:
Disclosed is a novel sulfated biopolymer, a method for synthesizing the sulfated biopolymer and an oil recovery method employing an aqueous fluid containing the material. The sulfated biopolymer is made by reacting polysaccharides with sulfuric acid in the presence of an aliphatic alcohol at a temperature of from 35.degree. to 75.degree. F., in order to avoid degradation of the polymer by the sulfuric acid. The polymer produces a viscous solution which is less prone to increasing viscosities as shear rate is decreased, which makes it especially suitable for use as a viscosifying polymer in a polymer flooding enhanced oil recovery process.

REFERENCES:
patent: 3208518 (1965-09-01), Patton
patent: 3352358 (1967-11-01), Williams
patent: 3373810 (1968-03-01), Williams
patent: 3498972 (1970-03-01), Nagasawa
patent: 3532166 (1970-10-01), Williams
patent: 4035569 (1977-07-01), Schweiger
patent: 4141842 (1979-02-01), Abdo

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