| 摘要 |
<p>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 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.</p> |
