Phase behavior of Brazilian stock tank oil and carbon dioxide at reservoir conditions: experiments and thermodynamic modeling

In the first part of this work, phase behavior data of Brazilian stock tank oil and carbon dioxide are reported. The statical synthetical method was used. This technique consists of injecting known amounts of stock tank oil and carbon dioxide in an equilibrium cell, from which the bubble point is de...

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Bibliographic Details
Published in:Journal of petroleum exploration and production technology 2016-03, Vol.6 (1), p.39-44
Main Authors: Araújo, C. B. K., Capitelli, F. O., Rajagopal, K., Corazza, M. L., Ndiaye, P. M.
Format: Article
Language:English
Subjects:
Brazil
Carbon dioxide
Critical pressure
Earth and Environmental Science
Earth Sciences
Energy Systems
Enhanced oil recovery
Equilibrium
Fractured reservoirs
Gasoline
Geology
Industrial and Production Engineering
Industrial Chemistry/Chemical Engineering
Mathematical models
Monitoring/Environmental Analysis
Offshore Engineering
Original Paper - Production Engineering
Petroleum industry
Petroleum production
Phase transitions
Pressure transducers
Raw materials
Reservoirs
Saturation
Studies
Tanks
Temperature
Thermodynamics
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Summary:In the first part of this work, phase behavior data of Brazilian stock tank oil and carbon dioxide are reported. The statical synthetical method was used. This technique consists of injecting known amounts of stock tank oil and carbon dioxide in an equilibrium cell, from which the bubble point is detected by an infrared device for a given temperature and then the corresponding pressure is recorded. In the second part of this work, thermodynamics modeling of experimental data was performed. The modified Peng–Robinson equation of state was used for predicting saturation pressure. A strategy for the estimation of the C 20+ fraction is discussed by considering the critical pressure along with the Chueh Prausnitz binary interaction parameters. Results show that the saturation pressure of the system Marlim/CO 2 is strongly affected by the concentration of carbon dioxide, while temperature exhibits unexpected effects on the phase transition pressure.
ISSN:2190-0558
2190-0566
DOI:10.1007/s13202-015-0165-y