CO2 influence on asphaltene precipitation
authors Cruz, AA; Amaral, M; Santos, D; Palma, A; Franceschi, E; Borges, GR; Coutinho, JAP; Palacio, J; Dariva, C
nationality International
journal JOURNAL OF SUPERCRITICAL FLUIDS
author keywords Asphaltenes; Carbon dioxide; Near-infrared spectroscopy; CPA
keywords PRESSURE PHASE-BEHAVIOR; EQUATION-OF-STATE; NEAR-INFRARED SPECTROSCOPY; CARBON-DIOXIDE; HYDROCARBON SOLVENTS; SUPERCRITICAL CO2; CRUDE OILS; AGGREGATION; TOLUENE; DEPOSITION
abstract The energy industry has registered a considerable growth of petroleum production from reservoirs located in deep and ultra-deepwater, mainly in Brazil. The Brazilian Pre-Salt fields, specifically, have shown high carbon dioxide content which favors the precipitation of organic particles such as asphaltenes. This scenario has turned flow assurance into a major technical and economic challenge for the exploitation of those fields. In this work a variable-volume cell equipped with a near-infrared probe was used to study the onset of asphaltene precipitation induced by carbon dioxide, evaluating the effects of pressure, temperature, asphaltene concentration, and system composition. Furthermore, the Cubic Plus Association (CPA) was applied to model the asphaltene precipitation. The results show that temperature and the oil model system composition were the parameters that most influenced the asphaltene stability, and that the CPA adequately described the asphaltene precipitation.
publisher ELSEVIER SCIENCE BV
issn 0896-8446
year published 2019
volume 143
beginning page 24
ending page 31
digital object identifier (doi) 10.1016/j.supflu.2018.08.005
web of science category Chemistry, Physical; Engineering, Chemical
subject category Chemistry; Engineering
unique article identifier WOS:000450378000004
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