Study Of Synergistic Effect Mechanism Between Asphaltene And Wax In Wax Deposition

The deposition of wax and asphaltene is a common phenomenon during the procedure of producing and transporting crude oil.The safe and economic operation of production facilities is impaired by the deposition of wax and asphaltene.It has an important theoretical and engineering significance to pay overall consideration to the behavior of wax and asphaltene and explore the essential factors of the deposition of wax and asphaltene.With the rotary dynamic wax device,deposits of model oil under different experimental conditions are collected by changing the speed,bath temperature,deposition time and the composition of the model oil.Combined with the study of the flow field distribution of experimental device,the composition of deposit is studied to investigate the essential factor of asphaltene deposition.The results show that under low speed conditions(n<100r/min),the cold finger wall temperature gradient,the mass and asphaltene content of the deposit are increasing as the rotation speed increases;however,under high speed conditions(n>100r/min),as the rotation speed increases,the cold finger wall temperature gradient is essentially constant,while the mass of the deposit decreased significantly and asphaltene content of the deposit reduces slightly.Under static conditions(n=0r/min),the composition of the initial gel is similar to model oil and asphaltene content of the deposit keeps steady,as the deposition time goes on.While under the dynamic condition(n=200r/min),there is obvious “aging” phenomenon and asphaltene content of the deposit rises with time.Besides,when elevating bath temperature and keeping temperature of cold finger constant,the mass of the deposit increases first,then decreases.