| 摘要 |
A new invert emulsion fluid has been invented which comprises an oleaginous liquid, a non-oleaginous liquid, and a protonated amine having the structure R-N<+>-H3 B<-> wherein R represents a C12-C22 alkyl group or a C12-C22 alkenyl group, a C3-C8 cycloalkyl group substituted with a C9-C14 alkyl or alkenyl group, or a C9-C14 alkyl or alkenyl group substituted with a C3-C8 cycloalkyl group and B<-> is the conjugate base of a water soluble acid and the protonated amine is in an amount sufficient to stabilize the invert emulsion. Such fluids are acidic and thus useful in drilling wells in which acidic gases such as CO2 or H2S are likely to be encountered and break, i.e. de-emulsify, the drilling fluid. The fluids may also be utilized in combination with acidic brine solutions to increase the density of the drilling fluid. |
