The Properties of Water-in-Oil Emulsion of KD18 Viscous Oils in Xintan Oilfield and its Viscosity Reduction Method

The mixture of KD18 viscous crude oils and associated water in Xintan Oilfield commonly is water -inoil emulsion, which bond water contains about 50%～60%. The viscosity reduction must be conducted due to the high apparent viscosity. In allusion to the properties of the mixture and the actualities of the mixture's transportation,a new method of viscosity reduction for this emulsion by chemicals adding to make its phase conversion, dispersion and emulsification is presented. Based on this method, some high-effective viscosity-reducing agents are developed. The study results show that the apparent viscosity of KD18 viscous crude oils at 50℃ and 51 s -1 can be reduced from 7000～10000 mPa·s to less than 100 mPa·s and reducing rate of viscosity is more than 98%,which provides an effective way to heavy viscous water-in-oil emulsion in reducing its viscosity.