OPTIMIZATION OF HEAVY OIL VISCOSITY REDUCER WITH UPGRADING PERFORMANCE FOR NB35-2 OILFIELD

According to the problem of high heavy oil viscosity in NB35-2 oilfield,the visbreaking performances of 13 kinds of viscosity reducer were valuated based on SARA transformation to improve the fluidity of heavy oil.The study showed that [Et 3 NH]ZnCl 3.Co2+was a preferable viscosity reducer with upgrading performance.Under the condition of mass ratio 1% between viscosity reducer and heavy oil,80℃,and reaction time 16h,the viscosity of heavy oil was irreversibly decreased,and viscosity-reduction rate reached to 22%.The [Et 3 NH] ZnCl 3.Co2+viscosity reducer improved the mobility of heavy oil through changing heavy oil itself composition,which was propitious to enhance heavy oil recovery.