Fluid loss control additives for oil-based well-working fluids
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United States of America Patent
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Jun 9, 1987
Issued Date -
N/A
app pub date -
Jul 12, 1985
filing date -
Jan 14, 1983
priority date (Note) -
Expired
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Abstract
Fluid loss control additives for oil-based well-working fluids comprise a solubilized lignite derivative and an oil-swellable or oil-soluble polymer. The solubilized lignite derivative may be oil-solubilized (e.g. a lignite/amine complex) or water-solubilized (e.g. causticized lignite) and may be incorporated in a polymer matrix or added to a dispersion of a polymer in an aqueous medium.
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