Water loss reduction agents

Details Water loss reduction agents Water loss reduction agents

1976-06-07

1978-05-23

Guynn, Herbert B.

Compositions

Leather or fur treating

252 85C, 252 855R, C09K 702

Patent

active

040909689

ABSTRACT:
Starch derivatives have been found to be effective water loss control additives in clay-free wellbore fluids. Generally the starch derivatives are starch ethers, starch esters and partially oxidized starch. The starch derivatives can be added to the wellbore fluid in either the gelatinized or ungelatinized form. Unlike ordinary unmodified starch, the starch derivatives are soluble in acids, stable in the presence of calcium chloride, do not undergo retrogradation and are stable at higher temperatures than unmodified starch.

REFERENCES:
patent: 2561418 (1951-05-01), Ryan
patent: 2876217 (1959-03-01), Paschall
patent: 2917506 (1959-12-01), Caldwell et al.
patent: 3852201 (1974-12-01), Jackson
patent: 3878110 (1975-04-01), Miller et al.
patent: 3953335 (1976-04-01), Jackson
patent: 3956141 (1976-05-01), Walker

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