Polysaccharide containing fluids having enhanced thermal stabili

Details Polysaccharide containing fluids having enhanced thermal stabili Polysaccharide containing fluids having enhanced thermal stabili

1993-12-14

1996-05-07

Tucker, Philip

Earth boring, well treating, and oil field chemistry

Earth boring

Contains organic component

507113, 507114, C09K 702

Patent

active

055146449

ABSTRACT:
The invention provides (1) a method of increasing the thermal stability of an aqueous polysaccharide-containing fluid by adding thereto magnesia and a thiosulfate salt; (2) a drilling, completion, or workover fluid comprising an aqueous liquid, a water soluble polysaccharide, magnesia, and a thiosulfate salt; and (3) an additive for increasing the thermal stability of an aqueous polysaccharide-containing fluid which comprises magnesia and a thiosulfate salt in a weight ratio of magnesia to thiosulfate salt from about 0.15/1 to about 6.67/1. The preferred magnesia has an activity index less than 100, most preferably less than 50. The preferred thiosulfate salt is sodium thiosulfate. The preferred polysaccharide is selected from the group consisting of xanthan gum, epichlorohydrin crosslinked starch, carboxymethyl cellulose, and mixtures thereof. The preferred aqueous liquid is a saturated sodium chloride solution.

REFERENCES:
patent: 3852201 (1974-12-01), Jackson
patent: 3953335 (1976-04-01), Jackson
patent: 3988246 (1976-10-01), Hartfiel
patent: 4025443 (1977-05-01), Jackson
patent: 4486340 (1984-12-01), Glass, Jr.
patent: 4900457 (1990-02-01), Clarke-Sturman
patent: 5407475 (1995-04-01), Lukach et al.

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