Low fluid loss heavy brines containing hydroxyethyl cellulose
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United States of America Patent
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Apr 23, 1991
Issued Date -
N/A
app pub date -
Apr 10, 1989
filing date -
Jun 20, 1980
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Expired
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Abstract
Disclosed are heavy brine compositions containing zinc bromide and one or more soluble salts selected from the group consisting of calcium chloride and calcium bromide, preferably having a density in the range from about 14.2 to about 16.0 pounds per gallon, which have a low API fluid loss. Also disclosed is a method of formulating certain heavy brines in which hydroxyethyl cellulose functions as a fluid loss additive.
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