Oil-based drilling fluids suitable for drilling in the presence of acidic gases
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United States of America Patent
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Jun 8, 1999
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N/A
app pub date -
Jun 30, 1998
filing date -
Aug 19, 1997
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Abstract
An alkaline-reserve-free, oil-based drilling fluid is disclosed as comprising an oleaginous liquid, and an amine surfactant having the structure R-NH.sub.2, wherein R represents a C.sub.12 -C.sub.22 alkyl group or alkenyl group. Such fluid is particularly useful in the drilling of subterranean wells in which CO.sub.2, H.sub.2 S or other acidic gases which adversely effect the rheologies and other properties of the drilling fluid are encountered. The alkaline-reserve-free oil-based drilling fluid permits the logging of acidic gases which otherwise could not be logged in the presence of lime or other alkaline.
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