Abstract: In this paper a new type of water-soluble viscosity reducer in high salinity water, which can be used in super-extra viscous crude oil production in wellbore, has been demonstrated in the lab. For the lack of clean water in an oil field in Xinjiang, the technology makes it possible to make use of formation water after a simple treatment. The formulation is 0. 05% HSF +0.05%XY-1+0.05%W. The viscosity reducer has a strong salt resistance. In the experiment, if the viscosity reducer is formulated by the formation water after the simple treatment, it also can obviously reduce the viscosity of the superextra viscous crude oils. This paper also demonstrates that an oilsoluble viscosity reducer can be used to reduce the viscosity of crude oil containing high asphalt and gum.

Key words: heavy oil, emulsification, oil-soluble viscosity reducer, salt resistance