Synthesis And Evaluation Of N - Aryl - Substituted Maleimide Heavy - Oil Viscosity Reducer

Heavy oil has high viscosity, poor mobility, which affect the mining and gathering of heavy oil, seriously. Therefore viscosity reduction technology of heavy oil is widely used in mining and gathering process, the development of oil soluble viscosity reductant and application in heavy oil gathering process is one of the important research direction.This paper synthesized three organic compounds, N-phenyl maleimide, N-benzyl maleimide and N-hydroxyphenyl maleimide, and ternary copolymerized three compounds with octadecyl methacrylate and acrylamide, respectively. Then, three oil soluble viscosity reductants were synthesized and their structures were characterized by using IR and1HNMR.Among three viscosity reducers, N-benzyl maleimide/octadecyl methacrylate/acrylamide terpolymers oil soluble viscosity reductant has a better viscosity reducing effect for the114#heavy oil in Xinjiang Windy City. The polymerization conditions of the viscosity reducer were determined by orthogonal experiment and single factor experiment:n (N-benzyl maleimide):n (acrylamide)=10:4:3, the quantity of initiator (AIBN) was1%of the total mass of the monomers, the reaction temperature was85℃and the reaction time was5h. When the viscosity reducer dosage was1000mg/L and heavy oil temperature was50℃, the solvent viscosity ratio reached36.1%with diesel conducted solvent. The viscosity reducer compounded with the surfactant sodium dodecyl benzene sulfonic acid in the quality ratio of1:2, which could raise the viscosity reduction rate to43.3%.Finally, viscosity reducing mechanism of oil-soluble viscosity agent was inquiried preliminary, through contrasting infrared spectra, electron micrograph photo and Uv-Vis spectrophotometer was used to determine the dispersion efficiency of viscosity reducers for asphaltene. The result indicating that viscosity agent could weaken the hydrogen bonding between colloid and asphaltene molecules, whittle their aggregation, which made the asphalt aggregate obvious dispersion, heavy oil form relative loose. In addition, introducing benzene ring with split effect to the viscosity agent molecules could improve the efficiency of viscosity agent dispersed asphaltene, and reduce the viscosity of heavy oil.