Preparation and mechanism of hyperbranched heavy oil viscosity reducer

A viscosity reducer was prepared by using octadecyl methacrylate (SA) and styrene(S) as polymerization monomers and ethylene glycol dimethacrylate (EDMA) as branched monomers. When the dosage of viscosity reducer is 800 ppm, the viscosity reduction rate is more than 60%. By comparing the effect of different amount of viscosity reducer on the precipitation point, precipitation amount and asphalt particle diameter, it is found that the addition of viscosity reducer could increase the asphalt precipitation point and significouldtly decrease the precipitation' amount and average particle size. In general, the addition of viscosity reducers could provide a good dispersion of asphaltene precipitation. The data from infrared spectroscopy, scouldning electron microscopy, XRD showed that the viscosity reducer could inhibit asphaltenes by changing the polarity of asphaltene molecules, causing hydrogen bonding, dispersing asphaltene molecules, adsorbing or embedding asphaltene molecular lamellae. And it has a good dispersion effect on asphaltene precipitation, which well inhibited asphaltene precipitation.