Calculation of the compressibility factor of gas-saturated oils

The article deals with a hypothetical model of the molecular structure of degassed and gas-saturated oils developed on the basis of the J. I. Frankel’s hole theory of liquid. Based on this model, the author of the article obtained semiempirical dependences for calculating compressibility factors of degassed and gassaturated oils. The fact that the obtained dependences are based on the noted model gives the necessary physical validity to them and the specific physical content to the empirical parameters contained in them. As a result, semi-empirical dependences become theoretical. Corresponding calculations confirm that their scope broadens as the types of oils and conditions for their finding.

Determining of volume coefficient of gas-saturated oils

The volumetric coefficient is widely used in various calculations related to the estimation of petroleum reserves, crude oil production, preparation and transport of oil. The existing methods of its calculation determination are mainly empirical that makes it difficult to use them in solving various tasks, primarily optimization problems. The article is devoted to the development of similar technique in the form of analytical dependence, devoid of the noted shortcomings. For this purpose, the provisions of the hole theory of the dropping liquid are used, on the basis of which a theoretically and physically justified expression acceptable for a wide range of gas-saturated oils under different conditions is obtained. The acceptability of dependence is tested on oil data from different regions of the country and near abroad. The obtained dependence makes it possible to calculate the volume coefficient at a pressure equal to the pressure of oil saturation with gas.