Experimental phase behavior and solubility parameter for crude oil + methane [T = 311.15–373.15 K] and crude oil + methane + CO2 mixtures [T = 343.15–383.15 K]

Experimental phase behavior and solubility parameter for crude oil + methane [T = 311.15–373.15 K] and crude oil + methane + CO2 mixtures [T = 343.15–383.15 K]

Asphaltenes insolubility is recognized as an important flow assurance problem during crude oil production. In this work, phase behavior for crude oil + methane and crude oil + methane + carbon dioxide mixtures were studied for two Brazilian pre-salt crude oil samples, with low asphaltenic content. F...

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Bibliographic Details
Published in:Fuel (Guildford) Vol. 288; p. 119675
Main Authors: Romero Yanes, José F., da Costa, Moacir F.L., Sampaio, João P.G., Chacón Valero, Angélica M., Feitosa, Filipe X., de Sant'Ana, Hosiberto B.
Format: Journal Article
Language:English
Published: Kidlington Elsevier Ltd 15-03-2021
Elsevier BV
Subjects:
Asphaltenes
Carbon dioxide
Chemical precipitation
Compressibility
Crude oil
Energy
Gas composition
Internal energy
Internal pressure
Methane
Oil
Parameter identification
Phase behavior
Phase equilibria
PVT
Reduction
Solubility
Solubility parameter
Solubility parameters
Systems analysis
Temperature
Solubility parameter
Phase behavior
Crude oil
Carbon dioxide
PVT
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Summary:Asphaltenes insolubility is recognized as an important flow assurance problem during crude oil production. In this work, phase behavior for crude oil + methane and crude oil + methane + carbon dioxide mixtures were studied for two Brazilian pre-salt crude oil samples, with low asphaltenic content. From PVT compressibility experimental data, phase equilibria were studied based on solubility parameter, cohesive energy, and internal pressure approach. For the crude oil + methane systems, methane content was evaluated from 25.0 to 75.0 mol%, at a temperature range from 313.15 to 373.15 K. No asphaltene precipitation was observed and a minimal solubility parameter was reached at the richest methane content. Additionally, a marked reduction of cohesive energy was observed increasing methane content, probably associated to the system asymmetry. For the crude oil + methane + CO2 systems, a constant gas composition of 75.0 mol% was studied. Carbon dioxide (CO2) content varied from 0.0 to 100.0 mol%, balanced with methane, for a temperature domain of 343.15 to 383.15 K. For these systems, asphaltene insolubility regions were detected. Moreover, the addition of CO2 contributed to asphaltene stabilization. Solubility parameter and internal energy increases were properly identified for these mixtures and it could be associated to the asphaltene region reduction.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2020.119675