New method to detect asphaltene precipitation onset induced by CO2 injection

Silva, N.A.E. da; Oliveira, Victor Rodrigues da Rocha; Souza, Marcos Miranda Silva; Guerrieri, Yuri; Costa, Glória Meyberg Nunes

doi:10.1016/j.fluid.2013.10.053

Cited by 15 publications

(15 citation statements)

References 17 publications

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“…Bubble pressure and MMP experimental data shown in Figure correspond to the oil (O4) chosen to be discussed in detail throughout this paper . For compositions corresponding to points “A” and “B“ there is no deposition of asphaltene, but for compositions equal to or greater than the value corresponding to point B, asphaltene precipitation occurs.…”

Section: Resultsmentioning

confidence: 99%

“…For compositions corresponding to points “A” and “B“ there is no deposition of asphaltene, but for compositions equal to or greater than the value corresponding to point B, asphaltene precipitation occurs. In Figure the CO 2 molar fraction corresponding to point “B” denotes an experimental asphaltene precipitation onset …”

Section: Resultsmentioning

confidence: 99%

“…By observing the bubble pressure behaviour it is possible to determine the exact value of CO 2 molar fraction at which asphaltene precipitation occurs. At the selected injection pressure, asphaltene precipitation is expected to occur at a CO 2 molar fraction equal to or greater than the value corresponding to the bubble pressure . A possible scenario is that at the CO 2 injection pressure, the bubble pressure curve has been incorrectly calculated and shifted to the right side of the experimental bubble pressure curve.…”

Section: Resultsmentioning

confidence: 99%

“…Table also shows the values of the CO 2 molar fraction and mass fraction expressed as the percentage error of the amount of asphaltene dissolved in the oil ΔS a (%) for each different value of the interaction parameter and for the best value of the binary interaction parameter. The amount of asphaltene that remains dissolved in the oil is calculated as recommended by Hirschberg et al [27] with several modifications to the oil characterization …”

Section: Resultsmentioning

confidence: 99%

“…Previous studies developed by our research group revealed that the CO 2 ‐oil mixture bubble pressure curves can be used as a simple approach to accurately determine the asphaltene precipitation onset …”

Section: Introductionmentioning

confidence: 99%

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CO₂‐oil saturation pressure and onset asphaltene precipitation

et al. 2015

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Partial miscible flooding using CO2 injection has been shown to be a promising method for enhanced oil recovery, but this injection could result in asphaltene precipitation, which clogs the reservoir and production equipment. Therefore, an important parameter to be monitored is the onset of asphaltene precipitation. The efficient displacement of oil by CO2 depends on a variety of factors, including phase behaviour of CO2/crude‐oil mixtures that requires an accurate description of the CO2‐oil mixture bubble pressure. Observing bubble pressure behaviour, it is possible to exactly determine the CO2 molar fraction for onset asphaltene precipitation, which is expected to occur when the selected injection pressure is equal to the bubble pressure at the same CO2 molar fraction. However, assessment of oil characterization relating CO2‐oil mixture bubble pressure and onset asphaltene precipitation has not been found in the literature and should be properly addressed. In this work, we employed the Soave‐Redlich‐Kwong equation of state and used CO2‐oil mixture bubble pressure experimental data from literature to show that the accuracy of onset asphaltene precipitation is quite affected by the binary interaction parameter between methane and C7+ fractions, and the density of this heavy fraction.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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