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2020/1
Prediction of thermodynamic properties and phase behavior of reservoir fluids for the design of oil and gas fields
Geosciences

Authors: Anatoly A. GERASIMOV graduated from the Grozny’s oil Institute named after academician M.D. Millionshikov in 1972, doctor of technical sciences, Professor of the Department of the “Heat and gas supply and ventilation” of Kaliningrad State Technical University. The author of more than 100 scientific works in the field of thermophysical properties of substances, including three monographs. E-mail: aager_kstu@mail.ru
Boris A. GRIGORIEV graduated from the Grozny’s oil Institute named after academician M.D. Millionshikov in 1963, the member of the Russian Academy of Sciences, doctor of technical sciences, Professor, head of the Department of the “Study of oil and gas reservoir systems” of Gubkin Russian State University of Oil and Gas (National Research Univer- sity). The author of more than 300 scientific works in the field of thermophysical properties of substances, the author of a textbook on heat and mass transfer for high schools and several monographs. E-mail: gba_41@mail.ru
Evgeny B. GRIGORIEV graduated from the Grozny’s oil Institute named after acade- mician M.D. Millionshikov in 1990. Assistant Professor, doctor of technical sciences. Leading Researcher of the Department of the “Study of oil and gas reservoir systems” of Gub- kin Russian State University of Oil and Gas (National Research University). Specialist in the field of thermophysical properties of working fluids and coolants. The author of more than 100 scientific works in the field of thermophysical properties of substances, including three monographs. E-mail: egb_8691@mail.ru
Igor S. ALEXANDROV graduated from the Kaliningrad State Technical University in 2004, candidate of technical sciences, Assistant Professor, head of the Department of the “Heat and gas supply and ventilation” of Kaliningrad State Technical University. The author of more than 80 scientific works in the field of thermophysical properties of substances. E-mail: alexandrov_kgrd@mail.ru

Abstract: This article proposes methods for calculating the thermodynamic properties and phase equilibria of reservoir fluids based on both empirical multi-constant equations of state and theoretically based equations obtained in the framework of the statistical theory of associated fluid (SAFT). The article also proposes an alternative technique based on the author’s generalized PC-SAFT equation of state. The article presents the results of comparative calculations of the thermodynamic properties of model hydrocarbon mixtures, as well as real reservoir systems based on the proposed methods. The most accurate calculation of thermodynamic properties in the single-phase region was shown by the multiconstant model. In particular, the accuracy of density calculation is 3-4 times higher than according to cubic equations of state. When testing this model regarding the calculation of phase equilibria, limitations were established that recommend its use for light gas condensates, in which the molar mass of the residue does not exceed 140 g/mol and the relative density of the residue does not exceed 0,730. For reservoir fluids that do not satisfy the condition described above, it is proposed to calculate phase equilibria using a model based on the author’s PC-SAFT equation of state that can be used to calculate phase equilibria and near the freezing point of the mixture, where cubic and multi-constant equations can lead to nonphysical phase diagram

Index UDK: 622.276

Keywords: density, heat capacity, saturation pressure, equation of state, reservoir fluid, oil, gas condensate

Bibliography:
1. Span R. Multiparameter Equation of State: An Accurate Source of Thermodynamic Property Data. Berlin: Springer, 2000, 367 p.
2. Kunz O., Klimeck R., Wagner W., Jaeschke M. The Gerg-2004 Wide-Range Equation of State for Natural Gases and Other Mixtures. Dusseldorf, 2007, 535 p.
3. Alexandrov I., Gerasimov A., Grigor’ev B. Generalized Fundamental Equation of State for Normal Alkanes (C5 — C50). Int. J. Thermophys, 2013, vol. 34, p. 1865-1905.
4. Grigoriev B., Alexandrov I., Gerasimov A. Generalized equation of state for the cyclic hydrocarbons over a temperature range from the triple point to 700 K with pressures up to 100 MPa. Fluid Phase Equilibria, 2016, vol. 418, p. 15-36.
5. Ke-Le Yan, Liu Huang, Sun Chang-Yu et. al. Measurement and calculation of gas compressibility factor condensate gas and natural gas under pressure up to 116 MPa. J. Chem. Thermodynamics, 2013, vol. 63, p. 38-43.
6. Huang Liu, Sun Chang-Yu, Yan Ke-Le, et. al. Phase behavior and compressibility factor of two China gas condensate samples at pressures up to 95 MPa//Fluid Phase Equilibria, 2013, vol. 337, p. 363-369.
7. Shariati A., Peters C.J., Moshfeghian M. Bubble-point pressures of some selected methane + synthetic C6+ mixtures. J. Chem. Eng. Data, 1998, vol. 43, p. 280-282.
8. Aleksandrov I.S., Grigor’ev B.A. Modelirovanie termodinamicheskih svojstv i fazovogo pove-deniya uglevodorodov i slozhnyh uglevodorodnyh smesej na osnove novogo PC-SAFT uravneniya sos-toyaniya. Nauchno-tekhnicheskij sbornik. Vesti gazovoj nauki. Sovremennye podhody i perspektivnye tekhnologii v proektah osvoeniya neftegazovyh mestorozhdenij rossijskogo shel’fa. M.: “Gazprom VNIIGAZ”, 2018, no. 4 (36), p. 237-248.
9. Otchet o NIR “Matematicheskoe modelirovanie fazovogo povedeniya plastovyh uglevodo-rodnyh smesej v kriticheskoj oblasti. opredelenie plotnostej sosushchestvuyushchih faz”. M.: RGU nefti i gaza (NIU) imeni I.M. Gubkina, 2018, 50 p.

2013/1
Specific Physical and Chemical Characteristics of Gas Condensates of Chayanda Gas Field
Drilling and development of hydrocarbon fields

Authors: Natalya M. PARFENOVA graduated from Turkmen polytechnic Institute in 1971. Candidate of Chemical Sciences, senior researcher of Laboratory of complex research of hydrocarbon systems of the Center of research oil and gas reservoir systems and technological modeling OOO “Gazprom Vniigaz”. Spesialist in the field of petrochemistry. She is author of 83 scientific publications. E-mail: N_Parfenova@vniigaz.gazprom.ru
Lidia S. KOSYAKOVA graduated from Moscow Institute of the chemical technology named M.V. Lomonosov in 1978. Senior researcher of Laboratory of complex research of hydrocarbon systems of the Center of research oil and gas reservoir systems and technological modeling OOO “Gazprom Vniigaz”. Spesialist in the field of gas-liquid chromatography of hydrocarbon fluids. She is author of 27 scientific publications. E-mail: L_Kosyakova@vniigaz.gazprom.ru
Evgeniy B. GRIGORIEV graduated from Grozny oil Institute named M.D. Millionszhikov in 1990. Doctor of Technical Sciences, academician of the Russian engineering Academy, the Russian Federation government prize in the field of science and technology, deputy head of the Center of research oil and gas reservoir systems and technological modeling OOO “Gazprom Vniigaz”. Spesialist in the field of the process of heat-mass exchange and thermo physical properties of substances and materials. He is author of 72 scientific publications. E-mail: E_Grigoriev@vniigaz.gazprom.ru
Ildar M. SHAFIEV graduated from Astrakhan State technical University in 1998, Gubkin Russian State University of Oil and Gas in 2008, head of Laboratory of complex research of hydrocarbon systems of the Center of research oil and gas reservoir systems and technological modeling OOO “Gazprom Vniigaz”. Spesialist in the field of thermodynamic studies of reservoir fluids. He is author of 17 scientific publications. E-mail: I_Shafiev@vniigaz.gazprom.ru
Aleksey E. RYZHOV graduated from Moscow Institute of petrochemical and gas industry named I.M.Gubkin in 1982. Candidate of Geological and mineralogical Sciences, director of the Center of research oil and gas reservoir systems and technological modeling OOO “Gazprom Vniigaz”. Spesialist in the field of studies of reservoir systems — reservoir rocks and contained in them fluids. He is author of 37 scientific publications. E-mail: A_Rizhov@vniigaz.gazprom.ru

Abstract: The physical and chemical characteristics of gas condensates of four exploration wells of three productive horizons of Chayanda gas field are studied. The features of fractional content, hydrocarbon type content and component composition are shown. The issue of the rational management of gas condensates is considered.

Index UDK: 553.981

Keywords: gas condensate, physicochemical properties, fractional composition, group composition, composition of the hydrocarbon, gasoline fractions, gas-liquid chromategraphy

Bibliography:
1. Ljugaj D.V. Osobennosti osvoenija i proektirovanija razrabotki Chajandinskogo NGKM// Gazovaja promyshlennost'. – 2010. – No. 14. – S. 56–58.
2. Chahmahchev V.A. Geohimicheskie i paleogeotermicheskie aspekty ocenki perspektiv neftegazonosnosti//Geologija nefti i gaza. – 1994. – No. 6. – S. 31–37.