Clay-free thixotropic wellbore fluid

Details Clay-free thixotropic wellbore fluid Clay-free thixotropic wellbore fluid

1974-05-24

1976-10-26

Guynn, Herbert B.

Compositions

Leather or fur treating

175 65, 252 85C, 252 855R, C09K 702

Patent

active

039882462

ABSTRACT:
A clay-free wellbore fluid having thixotropic properties, good surface handling characteristics and excellent subterranean characteristics such as particle handling gel strength, and low water loss has been devised by the combination of a heteropolysaccharide prepared by the action of bacteria of the genus Xanthomonas on carbohydrates, modified starch and MgO. In some situations a salt of lignosulfonate is added to maintain the desirable properties of the wellbore fluid.

REFERENCES:
patent: 2557473 (1951-06-01), Ryan
patent: 2561418 (1951-07-01), Ryan
patent: 2802783 (1957-08-01), Weiss et al.
patent: 2884413 (1959-04-01), Kerr et al.
patent: 3032498 (1962-05-01), Walker
patent: 3319715 (1967-05-01), Parks
patent: 3852201 (1974-12-01), Jackson
patent: 3872018 (1975-03-01), Alexander

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