Salt-resistance property and application of α-olefine polyether sulfonate
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 mg·L-1 to 150000 mg·L-1.In addition,the surfactant exhibited significant effect on reducing the surface tension of high salinity water from 80.5 mN·m-1 to 37.1 mN·m-1 at 30℃.Moreover,even when the concentration of calcium or magnesium cations in the water reached 10000 mg·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 mPa·s to 14 mPa·s.After demulsification,the intrinsic viscosity of the dewatered crude oil decreased by half.