Method for Judging the Stability of Asphaltenes in Crude Oil

Xiong, Ruiying; Guo, Jixiang; Kiyingi, Wyclif; Feng, Hengshui; Sun, Tao; Yang, Xiaohui; Qing, LI

doi:10.1021/acsomega.0c01779

Cited by 35 publications

(24 citation statements)

References 39 publications

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“…This suggests that the higher saturate content SRVRs would demonstrate a lower conversion level in the commercial ebullated-bed hydrocracker, based on the established negative statistically meaningful relation to the VR CII. 53 The higher influence of the saturate content on the oil colloidal instability is also supported by the finding of Xiong et al 82 that light oils are more susceptible to cause asphaltene deposition than heavy oils.…”

Section: Resultsmentioning

confidence: 86%

Commercial Investigation of the Ebullated-Bed Vacuum Residue Hydrocracking in the Conversion Range of 55–93%

et al. 2020

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The LUKOIL Neftohim Burgas vacuum residue hydrocracking has increased the vacuum residue conversion from 55 to 93% as a result of a proper feed selection, optimal catalyst condition, and the use of a Mo nanodispersed catalyst. It was found that the feed colloidal instability index estimated from the feed saturates, aromatics, resins, and asphaltenes (SARA) data negatively correlated with the conversion. Correlations based on the use of the nonlinear least-squares method, which relates the density to the aromatic structure contents for the straight run and hydrocracked vacuum residues, were developed. Intercriteria analysis was applied to evaluate the relations between the different properties of the straight run and the hydrocracked vacuum residual oils. The density of the hydrocracked vacuum residue measured by dilution with toluene was found to strongly correlate with the conversion, Conradson carbon content, softening point, and Fraasss breaking point.

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Section: Resultsmentioning

confidence: 86%

Commercial Investigation of the Ebullated-Bed Vacuum Residue Hydrocracking in the Conversion Range of 55–93%

et al. 2020

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“…Due to the complexity of the peptization, flocculation, and precipitation of asphaltene phenomena, several attempts of alternatives or modified methodologies for the measurement of crude oil stability have been reported. − …”

Section: Resultsmentioning

confidence: 99%

Evaluation of Asphaltene Stability of a Wide Range of Mexican Crude Oils

et al. 2020

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Appropriate prediction of asphaltene stability can anticipate operational problems such as plugging of lines and process equipment (pumps, heat exchangers, separation tanks, among others), thus assuring the production, processing, transportation, and storage of petroleum. In the present study, the physical and chemical properties of a series of Mexican crude oils with American Petroleum Institute (API) gravity ranging from 10 to 52 were determined. Based on saturate, aromatic, resin and asphaltene (SARA) analysis, the following indexes were calculated: colloidal instability index, colloidal stability index, Stankiewicz stability criterion, stability cross plot, and oil compatibility model. The stability of crude oils was also evaluated by means of experimental techniques such as spot test, S-value, and static stability test column. No uniform results were obtained when determining the stability of crude oils with different methodologies. Due to the discrepancies disclosed, it is recommended to evaluate stability by various methodologies to adequately predict the stability of asphaltenes in crude oils. Hence, the stability of asphaltenes in a given crude oil may be ascribed based on the average result. However, from a practical point of view, pertinent cautions on the handling of samples must be observed if at least one of the methods classifies the sample as unstable or metastable.

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“…Several attempts were performed and reported the characterization of the asphaltenes fraction. [69][70][71] Results of the characterization described asphaltenes either as complex macromolecules or as a colloidal suspension stabilized by resin molecules. It is well known that the asphaltenes component rapidly precipitates in the presence of shear (turbulent flow), as well as acidic compounds, carbon dioxide solution, decreased pressure that could alter the stability of asphaltenes dispersion.…”

Section: Hawsp As Dispersing Agent Of Asphaltenesmentioning

confidence: 99%

Behavior study of a thermo‐responsive hydrophobically associative water‐soluble terpolymer in laboratory test with heavy crude oil

Torres‐Martínez

Pérez-Álvarez²,

Jiménez‐Regalado³

et al. 2022

J of Applied Polymer Sci

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In this work, a thermo‐responsive hydrophobically associative water‐soluble terpolymer was prepared and evaluated as polymer flooding in laboratory tests versus a heavy crude oil from a carbonated reservoir in southern Mexico. Terpolymer of acrylamide, N‐isopropylacrylamide and N,N′‐dihexylacrylamide were synthesized via micellar free radical polymerization. Reaction was carried out at 50°C using sodium dodecyl sulfonate as surfactant and 4‐(4′‐azobis)cyanovaleric acid as initiator. The terpolymer was characterized by nuclear magnetic resonance. Steady shear viscosity of polymer solutions at different concentrations was determined in the presence of NaCl (from 1 to 5 wt%) at different temperatures (from 25 to 120°C). Heavy crude oil sample was characterized and revealed a viscosity of 2. 26 Pa s, 10.21° API with a content of Saturates, Aromatics, Resins, Asphaltenes of 26.4, 38.5, 22.3, and 12.8, respectively. The crude oil recovery of polymer at 2 and 3 wt% revealed a surface tensions of 49.6 and 48.2 mN × m and adsorption capacities of 1.33 and 1.77 wt%. Finally, polymer solutions at 2 and 3 wt% showed a contact angle between 29.6 and 26.5° and a crude oil recovery of 68.3 and 75.3%, respectively.

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Method for Judging the Stability of Asphaltenes in Crude Oil

Cited by 35 publications

References 39 publications

Commercial Investigation of the Ebullated-Bed Vacuum Residue Hydrocracking in the Conversion Range of 55–93%

Commercial Investigation of the Ebullated-Bed Vacuum Residue Hydrocracking in the Conversion Range of 55–93%

Evaluation of Asphaltene Stability of a Wide Range of Mexican Crude Oils

Behavior study of a thermo‐responsive hydrophobically associative water‐soluble terpolymer in laboratory test with heavy crude oil

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