Biodegradable drilling mud and process for its preparation
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United States of America Patent
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Jul 30, 2002
Grant Date -
N/A
app pub date -
Mar 21, 2000
filing date -
Mar 22, 1999
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Abstract
A biodegradable drilling mud, comprising a water/organic phase reverse emulsion in a volume ratio ranging from 50/50 to 10/90, which contains: a) from 1 to 5% by volume of at least one nitrogen compound selected from the group consisting of amino acids, carbamic mono- and polyamides and mono- and polycarbamic amides, of formulae (I) and (II) respectively, taken alone or as a mixture: R--[NH--CH.sub.2 ].sub.n --CO--NH.sub.2 (I) R--NH--[CO--NH].sub.m --H (II) wherein R is hydrogen or an alkyl group comprising from 1 to 10 carbon atoms and n and m are integers ranging from 1 to 5, b) from 2 to 10% by volume of at least one phosphorus derivative selected from the group consisting of surfactant phosphorus compounds, and c) from 2 to 10% by volume of at least one oxygenated compound selected from the group consisting of fatty acids, fatty acid esters of fatty alcohols comprising carbon-based chains comprising from 12 to 24 carbon atoms, alone or as a mixture, and plant or animal oils.
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