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Calculating densities and viscosities of natural gas with a high content of C_(2+) to predict two-phase liquid-gas flow pattern

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Petroleum 2023年第4期9卷 579-591页

作者： Yekaterina Moisseyeva Alexandra Saitova sergey strokin Peter the Great St.Petersburg Polytechnic University Russian Federation

The paper is devoted to the two-phase flow *** gas-condensate mixture flow in a horizontal pipe under high pressure is *** influence of the equation of state(EOS)choice for mixture properties modelling on the flow regime calculation results is studied for gas with high content of methane *** analytical overview of the methods to predict the flow pattern is *** on this analysis,two techniques are *** these techniques,values of density and viscosity for each phase are *** calculation for the gas phase is performed with Van der Waals based *** propriate EOS is selected based on studies of calculation errors for test *** of liquid phase density is done by means of Patela-Teja and Guo-Du equations,two different models are considered for viscosity *** flow patterns of gas-condensate mixture in a range of temperatures and pressures are calculated and verified via probability *** results of study allow to recommend the Brusilovsky EOS for calculation of densities for similar gas mixtures and make more rigorous flow regime *** probability map shows that for the chosen composition and parameters of media the flow pattern is mostly transitional between segregated and annular independent from EOS.

关键词： Two-phase flow Flow pattern Natural gas Wet gas High content of C_(2+) High pressure

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Energy efficiencies and CO_(2)emissions associated with lowtemperature separation technologies for the processing of formation fluid from the Achimov deposits

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Petroleum Research 2023年第3期8卷 413-423页

作者： Alexandra Saitova sergey strokin Falk Ahnert Aleksandr Chepurnov Peter the Great St Petersburg Polytechnic University Politechnicheskaya str.29Saint Petersburg195251Russian Federation Wintershall Dea AG Friedrich-Ebert-Straße 160Kassel34119Germany Wintershall Dea Russia GmbH Reshetnikova str.14ASaint Petersburg196105Russian Federation

Three different technologies for the low-temperature separation(LTS)of gas condensate from the Achimov deposits in the Russian Urengoyskoe gas and condensate field were assessed using exergy *** options examined included turbo-expansion and *** exergy values were calculated for material streams and exergy losses and efficiencies were estimated for dedicated equipment used in the *** lowest exergy loss of 4221.2 kW was obtained using turboexpansion and electricity *** carbon release associated with each scenario was calculated while considering different production rates,technological parameters and natural decreases in wellhead *** integral carbon footprint after 40 years of LTS operation was estimated for all cases.A classical ejector-based LTS scheme was shown to produce 1200 t of CO_(2)emissions over 40 years of *** same scheme combined with a turboexpander and electricity generator produced 59%less CO_(2)in the same *** expansion-cogeneration LTS scheme was found to be the most effective and ecologically friendly among the various options based on this analysis.

关键词： Oil and gas field Gas condensate Carbon emission Carbon footprint Complex gas treatment unit

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