Clay-free, thixotropic wellbore fluid

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

1978-03-13

1981-01-27

Guynn, Herbert B.

Compositions

Leather or fur treating

252 855R, C09K 702

Patent

active

042474027

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: 2856356 (1958-10-01), Weiss et al.
patent: 3046221 (1962-07-01), Dodd
patent: 3220947 (1965-11-01), Sawyer
patent: 3319715 (1967-05-01), Parks
patent: 3928211 (1975-12-01), Browning et al.
patent: 3953335 (1976-04-01), Jackson
patent: 3986964 (1976-10-01), Smithey
patent: 3988246 (1976-10-01), Hartfiel
patent: 4098700 (1978-07-01), Hartfiel
patent: 4140639 (1979-02-01), Jackson

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