Model of the molecular structure of capillary liquid and gas-saturated oils

Abstract

The article describes model of the molecular structure of capillary liquid, developed on the basis of the molecular-kinetic theory of liquid, created by J. I. Frenkel and other researchers. This model supplements the existing theory with a number of provisions, on the basis of which a new view of both capillary liquid in general and such a variety as gas-saturated oils is formulated. The validity of the model (at least a number of its ideas about the molecular structure of gassaturated oils) is confirmed by obtaining dependencies on the basis of this model for calculating such parameters of gas-saturated oils as the compressibility factor, volume coefficient and density. These dependences are distinguished by a clear mathematical structure, reflecting the physical content of the parameters determined from them, meet the boundary conditions and contain the main factors on which the calculated parameters depend. The legitimacy of the obtained model is also evidenced by the explanation on its basis of the "conditionally liquefied" state of gas in oil recognized by all researchers and the disclosure of the physical content of such a concept as "apparent density of gas in oil", which is noted in many works. Objective indicators of the validity of the developed model are the results of checking the dependences obtained on its basis according to the data for oils from different regions of Russia and neighboring countries. The check showed satisfactory convergence of the calculation results with the experimental data. The combined qualities of the model and the dependences obtained on its basis allow us to note that the proposed model can be considered as one of the alternative views on the physical nature of capillary liquid and oil.