Filtration control additive for invert emulsion drilling fluids and method of preparation
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United States of America Patent
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-
Mar 1, 1988
Issued Date -
N/A
app pub date -
May 27, 1986
filing date -
Nov 18, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a filtration control additive for use in invert emulsion drilling fluids; the method of preparing such additive; the invert emulsion drilling fluid produced therefrom; and a method of drilling, completing, and working over a subterranean well, utilizing such drilling fluid containing the filtration control additive which is utilized in a water-in-oil, emulsion-type subterranean drilling fluid. The additive comprises the pyrolyzed product obtained by intermixing and heating a finely divided humic acid-containing material and a primary amine having an alkyl radical of 10 to 20 carbon atoms or a primary amine having one alkyl-substituted phenyl radical, the alkyl radical having 10 to 20 carbon atoms. The amine may also be a secondary amine having at least one alkyl radical of 8 to 20 carbon atoms.
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