Research and application of composite wellbore viscosity-reduction technology about heavy oil in Tahe Oilfield

Since the effects of individual viscosity reduction were limited in the Tahe Oilfield, composite viscosity reduction technologies were discussed. Laboratory experiments showed that water-oil soluble viscosity-reducing agents could emulsify heavy oils with viscosity higher than 100×10⁴ mPa·s. The compound of heated and oil-soluble viscosity-reducing agents had better effects. Field works indicated that the chemical compound viscosity reduction could save light oils by 69.8%, and the heated and oil-soluble viscosity reduction could save light oils by 51.27%.