Inventors:
Arvind D. Patel - Houston TX
Jayanti S. Patel - Houston TX
Harris A Oehler - Houston TX
International Classification:
E21B 2100, E21B 4900, C09K 706
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.