Heteropolysaccharide solutions stabilized against viscosity loss

Details Heteropolysaccharide solutions stabilized against viscosity loss Heteropolysaccharide solutions stabilized against viscosity loss

1985-12-05

1990-02-06

Richman, Barry S.

Chemistry: molecular biology and microbiology

Micro-organism, tissue cell culture or enzyme using process...

Preparing compound containing saccharide radical

435104, C12P 1904

Patent

active

048988197

ABSTRACT:
Aqueous saline solutions of ordered heteropolysaccharides useful, e.g., as displacement fluids in the secondary or tertiary recovery of crude oil from subterranean formations thereof, are stabilized against viscosity loss over temperature and time without adversely affecting the filterability thereof, by purging dissolved oxygen therefrom by degassing same with carbon dioxide, and then treating the degassed solutions with an effective amount of a reducng/deoxidizing agent as to maintain the pH thereof at a value ranging from 5 to 7.

REFERENCES:
patent: 4425246 (1984-01-01), Holzwarth et al.
patent: 4458753 (1984-07-01), Philips et al.

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