OIL BASED DRILLING FLUIDS SUITABLE FOR DRILLING IN THE PRESENCE OF ACIDIC GASES

摘要

An alkaline-reserve-free, oil-based drilling fluid is disclosed as comprisin g an oleaginous liquid, and an amine surfactant having the structure R-NH2, where in R represents a C12-C12 alkyl group or alkenyl group. Such fluid is particularl y useful in the drilling of subterranean wells in which CO2, H2S or other acidic gase s which adversely effect the rheologies and other properties of the drilling fluid a re 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.