Structural And Mechanical Properties Of Oils From The Muradkhanly And Sangachal-Deniz Fields Of Azerbaijan

Abstract

In the range of 278-293 K, the structural-mechanical properties of high-viscosity asphaltene-resinous and highly solidifying paraffinic oils of the Muradkhanly and Sangachal-deniz fields of Azerbaijan, which exhibit abnormal viscosity at various shift rates and are characterized by non-Newtonian, viscoplastic and thixotropic properties, have been studied. According to the Eyring-Frenkel equation, the activation energies of the viscous flow Ea and the change in the entropy ΔS of these oils are calculated for the indicated temperature range. Various algorithms for estimating the thermodynamic parameters of the flow ΔH and ΔS published in the literature are analyzed, and the scatter of the values of the estimates of parallel calculations is shown. It is shown that with a decrease in temperature, phase transitions in oils are activated, in particular, for the highly solidifying paraffin oil Sangachal-deniz, it originates from 297 K. For the oils under consideration for the selected shift rate of 67 s-1, the values of the temperature of the beginning of structure formation, static and limiting dynamic shift stresses were determined: for Muradkhanly oil T = 282.83 K, Sangachal-deniz - T = 297.23 K. The results obtained can be used to predict the behavior of oils