Empirical and Correlative Study of PVT Proprieties of Algerian Oil

Abstract

The knowledge of the Pressure - Volume - Temperature (PVT) parameters is of an major importance in calculations of the properties of the fluids and the development of the layers, namely, the determination of the bubble pressures (Pb) and the factor of volume of oil formation (Bo), the design of the treatment units of the fluids and the estimate of the volumetric characteristics in the oil tanks.In absence of PVT data, the use of the correlations is capital for the prediction of PVT properties, thus the properties associated. Sight the geological effect, which represents the modification of the chemical composition of crude oil from one area to another, it is difficult to obtain such a precise result thanks to empiricisms, from this point of view, correlations PVT must be studied and modified according to the regional characteristics of oils.The development of correlations PVT was the scientific research task object many, which contributed to a great number of publications in differing, re-examined. Several graphic correlations (in the form of abacus) and mathematics are developed during two last decades to determine, in particular, Pb and Bo. These correlations are primarily based on the assumption that Pb and Bo are in functions direct with the rate of gas-oil solution (Rs), the temperature of tank (Tf), the specific gravity of gas (γg), and the specific oil gravity (γo). Moreover, the success of such a correlation depends mainly on the beach of the experimental data at which it was developed, as well as the geographical area.