N-vinyl lactam/unsaturated amide copolymers in thickened acid compositions
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United States of America Patent
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Mar 25, 1986
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N/A
app pub date -
Mar 5, 1984
filing date -
Mar 5, 1984
priority date (Note) -
Expired
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Abstract
Water soluble thickened acid compositions suitable for matrix or fracture acidizing are provided comprising water, an acid, and a water thickening amount of a copolymer of a N-vinyl lactam and an unsaturated amide. This composition can contain in addition a crosslinking agent to give a gelled acid composition. In a preferred embodiment, a lactam-containing copolymer is made in a diluent containing dissolved electrolytes. These compositions are particularly useful in acid or matrix fracturing in subterranean formations exhibiting a hostile environment, as exemplified by high temperatures and/or high concentration of multivalent metal cations.
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