Drilling fluid additives for use in hard brine environments
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United States of America Patent
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-
May 10, 1988
Grant Date -
N/A
app pub date -
Nov 24, 1986
filing date -
Nov 24, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drilling fluid additive is disclosed which will prevent water loss into subterranean formations during the drilling of oil and gas wells in hard brine environments. The drilling fluid additive comprises a hydrocarbon, an anionic surfactant, an alcohol, a sulfonated asphalt, a biopolymer, and optionally an organophilic clay, poly(N-vinyl-2-pyrrolidone-co-sodium-2-acryamido-2-methylpropane sulfonate, and water.
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