A NEW PREDICTIVE THERMODYNAMIC MODEL OF PARAFFIN FORMATION WITH THE CALCULATION OF THE MATHEMATICAL ORIGIN OF THE POYNTING CORRECTION FACTOR
Ismailova J.A. Khussainova A.R. Zerpa L.E. Delikesheva D.N. Ismailov A.A.
2023National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2023#2023Issue 396 - 107 pp.
One of the major and big problems of the oil industry is the deposition and crystallization of paraffin. This process can appear at any point in the design of the production process. Wax precipitation is a thermodynamically controlled process that leads to an increase in the viscosity of the oil mixture, a decrease in the internal diameter of wells and pipelines. Wax appearance temperature (WAT) is one of the important characteristics of the wax deposition process. To manage this procedure, it is required to mathematically accurately forecast the temperature at which the wax possibly could appear, to analyze the phase equilibrium of the system. This article discusses the development of a thermodynamic theoretical model for calculating the paraffin precipitation, using a mathematical approach and experimental data. To consider the issue of phase equilibrium, the fugacity parameter of the pure component is analyzed. This article shows the Poynting correction factor, which is expressed as a function of fugacity at certain pressures and temperatures and fugacity at saturation. This aspect allows one to analyze the phase state of the system at high pressures. One of the important indicators that affects the behavior of wax deposition in the oil mixture is the melting point temperature. This paper presents the correlation of melting temperature, which is characterized by dependence on pressure and molecular weight of the components. Using this theoretical model, the calculation of the Poynting Correction factor, accurately predicts the wax appearance temperature as well as the weight of deposited wax.
fugacity , phase behavior , Poynting correction , pressure , temperature
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Satbayev University, Almaty, Kazakhstan
Polytechnic University of Turin, Turin, Italy
Colorado School of Mines, Golden, United States
Kazakh - British Technical University, Almaty, Kazakhstan
Satbayev University
Polytechnic University of Turin
Colorado School of Mines
Kazakh - British Technical University
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