Fluid phase equilibria of Brazilian presalt crude oil – CO2 systems at high pressure and high temperature

This paper aims to conduct an experimental investigation of the fluid phase behavior of a highly opaque Brazilian pre-salt crude oil-CO2 system, specifically focusing on the occurrence of highly dispersed liquid-liquid transitions. The study involves examining the phase behavior of five global mole...

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Bibliographic Details
Published inThe Journal of supercritical fluids Vol. 201; p. 106033
Main Authors Medeiros, Hugo Andersson Dantas, Alves, Alanderson Arthu Araújo, Daridon, Jean Luc, de Sant’Ana, Hosiberto Batista, Feitosa, Filipe Xavier
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.10.2023
Subjects
Brazilian crude oil
Carbon dioxide
Liquid-liquid equilibrium
Phase behavior
Liquid-liquid equilibrium
Phase behavior
Brazilian crude oil
Carbon dioxide
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Summary:This paper aims to conduct an experimental investigation of the fluid phase behavior of a highly opaque Brazilian pre-salt crude oil-CO2 system, specifically focusing on the occurrence of highly dispersed liquid-liquid transitions. The study involves examining the phase behavior of five global mole compositions [zCO2= (37.9, 50.0, 76.6, 80.6, and 84.2) mol%] by using conventional PVT techniques as light scattering, pressure-volume curve, and direct fluid observation through sapphire windows. When other techniques were ineffective, a high-pressure microscope coupled with a short-wave infrared apparatus (SWIR camera and light source) was used for complex fluid inspection. [Display omitted] •Experimental measurements LV, LL, and SLL phase equilibria are presented.•4 isopleth phase diagrams for Brazilian pre-salt crude oil + CO2 are present.•Liquid-liquid equilibrium undetected by NIR transmittance signal.•Fluid inspection using short wave infrared coupled in high pressure microscope.
ISSN:0896-8446
1872-8162
DOI:10.1016/j.supflu.2023.106033