| 摘要 |
An i n vert emulsjon drilling fluid employing as a suspensjon agent very fine sized fumed silica in combination with a primary viscosifier suen as for example a fatty dimer diamine, and a method for the use thereof in drilling wellbores, with good rheological properties at high temperatures and pressures. In one embodiment the drilling fluid is free of organophilic clays and lignites and free of non-hydrophilic "low gravity solids," and the fumed silica is a hydrophilic fumed silica, which provides enhanced suspensjon of drill cuttings without barite sag while maintaining good rheological properties at high temperatures and pressures. |
