Epoxyethylene and epoxypropylene were polymerized by double metal cyanide (DMC) with unsaturated alcohol as initiator.The obtained polyether was sulfonated

and neutralized to prepare a salt-resisting surfactant.The surfactant resisted water salinity in a range of 2000 mg8226;L-1 to 150000 mg8226;L-1.In addition

the surfactant exhibited significant effect on reducing the surface tension of high salinity water from 80.5 mN8226;m-1 to 37.1 mN8226;m-1 at 30℃.Moreover

even when the concentration of calcium or magnesium cations in the water reached 10000 mg8226;L-1

the surfactant solution remained colorless and transparent without deposition and flocculation.The experiment in oil field indicated that the salt-resisting surfactant reduced the viscosity of water-containing heavy oil from 85000 mPa8226;s to 14 mPa8226;s.After demulsification

the intrinsic viscosity of the dewatered crude oil decreased by half.