Well servicing fluid
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United States of America Patent
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Jul 2, 1991
Grant Date -
N/A
app pub date -
Dec 31, 1990
filing date -
Dec 31, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An additive for well servicing fluids containing a partially hydrolyzed acrylamide for use in downhole environments having a high calcium ion content comprising an alkali metal bicarbonate, a water-soluble carboxylic acid and a copolymer of acrylamide, an acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid, the additive being used to formulate aqueous well servicing fluids, particularly drilling fluids, and for a method of treating an aqueous well servicing fluid containing partially hydrolyzed acrylamide to prevent unwanted reactions between calcium ions and the partially hydrolyzed polyacrylamide.
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