Acrylamide terpolymer shale stabilizing additive for low viscosity oil and gas drilling operations
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United States of America Patent
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May 4, 1993
Issued Date -
N/A
app pub date -
Jun 30, 1992
filing date -
Jun 13, 1991
priority date (Note) -
Expired
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Abstract
A low viscosity drilling fluid and method for stabilizing a downhole shale formation are disclosed. The fluid comprises an aqueous solution of a partialy transamidated hydrolyzed acrylamide copolymer, potassium chloride, a weighting agent and an optional viscosifying agent. The copolymer comprises from about 50 to about 98 mole percent primary amide functionality, from about 0.1 to about 15 mole percent secondary amide functionality and from about 2 to about 50 mole percent of the acrylate salt. The drilling fluid has a density out from about 8 to about 18 pounds per gallon and a viscosity of from about 5 to about 30 centistokes.
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