Earth boring – well treating – and oil field chemistry – Earth boring – Contains organic component
Patent
1997-01-03
1998-12-22
Tucker, Philip
Earth boring, well treating, and oil field chemistry
Earth boring
Contains organic component
507212, 536106, 536107, 536111, C09K 702, C08B 3100
Patent
active
058519599
ABSTRACT:
A modified starch polymer derived from an unmodified starch having an amylopectin content of at least 80% by weight. The starch is modified by crosslinking with epichlorohydrin, the amount of epichlorohydrin crosslinking being equivalent to that which is obtained when a crosslinking reaction is subjected to a Brabender viscosity which reaches a maximum value and then is reduced with further crosslinking from its maximum to a value which is no more than 50% of the maximum value, and is carboxymethylated with a degree of substitution of at least 0.1 carboxymethyl groups per anhydroglucose unit. Fermentation stability is obtained when the degree of carboxymethyl substitution is about 0.4 or more. The modified starch polymer may also be hydroxypropylated. The modified starch polymers provide improved high temperature fluid loss performance when incorporated into well drilling fluids. They may also be used in other applications for which cellulosic polymers have heretofore been employed because of their better high temperature tolerance compared to conventional starch polymers.
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Chemstar Products Company
Tucker Philip
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