Wellbore fluid

Details Wellbore fluid Wellbore fluid

1980-12-19

1983-12-27

Guynn, Herbert B.

Compositions

Leather or fur treating

252 85A, 252 855R, C09K 702

Patent

active

044229470

ABSTRACT:
A clay-based or clay-free aqueous thixotropic wellbore fluid having improved fluid loss control, desirable flow characteristics and low shale sensitivity for use in drilling a well comprising water or a brine base including an effective amount of an additive comprising a crosslinked potato starch, a heteropolysaccharide derived from a carbohydrate by bacteria of the genus Xanthomonas, and hydroxyethylcellulose or carboxymethylcellulose, is disclosed. This drilling fluid has been found to be nondamaging to the formations through which the well is drilled.

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patent: 3988246 (1976-10-01), Hartfiel
patent: 3993570 (1976-11-01), Jackson et al.
patent: 4090968 (1978-05-01), Jackson et al.
patent: 4147211 (1979-04-01), Sandiford

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