Acrylamide terpolymer shale stabilizing additive for low viscosi

Details Acrylamide terpolymer shale stabilizing additive for low viscosi Acrylamide terpolymer shale stabilizing additive for low viscosi

1992-06-30

1993-05-04

Geist, Gary

Earth boring, well treating, and oil field chemistry

Earth boring

Contains organic component

C09K 702

Patent

active

052082164

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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J. A. Wingrave, et al., SPE 166787, 1987.
B. G. Chesser, International Association of Drilling Contractors/Society of Petroleum Engineers (IADC/SPE) 14757, 1986.

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