Investigating the low-temperature properties of oil by the method of dielectric spectroscopy

Abstract

The article is devoted to the possibility of using the dielectric spectroscopy method for assessing the low-temperature properties of oil. For 25 samples of oil in the fields of Tyumen region the physical and chemical characteristics have been determined, in the temperature range dielectric permittivity ℇ and the tangent angle of dielectric losses tg δ were obtained. The dielectric relaxation of oil was established. The calculated values of dielectric relaxation parameters made it possible to interpret this process as a glass transition process. The glass transition temperature tС and the region of structural solidification ∆t of oil have been determined. The dependences of tС and ∆t of oil on its physico-chemical characteristics have been established and investigated by methods of correlation and regression analysis. The glass transition temperature tС and the temperature range of structural solidification ∆t have been proposed to estimate the lowtemperature properties of oil. In the future, on the basis of data obtained, recommendations for application of dielectric spectroscopy method for forecasting and operational control of some (individual) characteristics of oil in the processes of its production, collection, preparation and transportation can be developed.