油溶性降黏剂的分子动力学模拟及合成

MOLECULAR DYNAMICS SIMULATION AND EXPERIMENTAL SYNTHESIS OF OIL-SOLUBLE VISCOSITY REDUCER

为了降低稠油黏度,改善其流动性,通过分子动力学模拟结合正交试验的方法,以甲基丙烯酸十八酯(SMA)、N-苯基马来酰亚胺(N-PMI)和乙酸乙烯酯(VA)为单体,共聚合成了油溶性降黏剂(SNV)。模拟结果表明:加入SNV后稠油密度降低,势能提高,表明SNV能够破坏胶质沥青质之间的三维网状结构,抑制胶质沥青质缔合,达到稠油降黏的目的。试验结果表明:SNV最佳合成条件为单体SMA,N-PMI,VA物质的量比10∶1∶6、引发剂质量分数0.5%、反应时间6 h、反应温度50℃;此合成条件下稠油降黏率可达43.76%,降黏效果优于部分商用降黏剂。

In order to reduce the viscosity and improve the fluidity of heavy oil,molecular dynamics simulation combined with orthogonal test was carried out.Octadecyl methacrylate(SMA),N-phenyl maleimide(N-PMI)and vinyl acetate(VA)were used as monomers,and oil-soluble viscosity reducer(SNV)was synthesized by copolymerization.The simulation results showed that the density of heavy oil decreased and the potential energy increased after adding SNV,which means that SNV could destroy the three-dimensional network structure between resins and asphaltenes,and inhibit the association of resins and asphaltenes.The test results showed that the optimum synthesis conditions of SNV were as follows:monomer molar ratio of SMA N-PMI VA of 10∶1∶6,initiator amount of 0.5%,reaction time of 6 h and reaction temperature of 50℃.Under this synthetic condition,the viscosity reduction rate of heavy oil could reach 43.76%,which was better than some commercial viscosity reducer.The molecular dynamics simulation results were consistent with the test results.