Assessment of correlations and simulation software to calculate phase diagrams of pre-salt fluids

The presence of heavy n-alkanes , together with CO 2 and water, affects the accuracy of existing correlations used in equations of state. Moreover, they impact the performance of simulation software, resulting in flawed calculations. In this work, the most used correlations for predicting the proper...

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Bibliographic Details
Published in:Petroleum science and technology 2021-06, Vol.39 (11-12), p.410-420
Main Authors: Allahyarzadeh-Bidgoli, Ali, Heidaryan, Ehsan, Yanagihara, Jurandir Itizo, Pessôa Filho, Pedro de Alcântara
Format: Article
Language:English
Subjects:
Alkanes
Computational fluid dynamics
Equations of state
heavy n-alkanes
Mathematical analysis
Numerical stability
Phase diagrams
pre-salt reservoir
Software packages
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Summary:The presence of heavy n-alkanes , together with CO 2 and water, affects the accuracy of existing correlations used in equations of state. Moreover, they impact the performance of simulation software, resulting in flawed calculations. In this work, the most used correlations for predicting the properties of heavy n-alkanes are analyzed. Calculations were made using commercial software packages for two compositions of pre-salt reservoirs, and considering the Peng-Robinson and the Soave-Redlich-Kowng equations of state. The properties of the estimated C 20+ fraction affected the numerical stability, and the calculated PT diagrams are unexpected. The reasons for the observed pitfalls are discussed.
ISSN:1091-6466
1532-2459
DOI:10.1080/10916466.2021.1906700