Experimental Setups for Studying the Compatibility of Crude Oil Blends under Dynamic Conditions

Rodríguez, Sergio Haro; Ancheyta, Jorge; Guzmán, Roque; Trejo, Fernando

doi:10.1021/acs.energyfuels.6b01698

Cited by 15 publications

(9 citation statements)

References 47 publications

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“…The colloidal instability index (CII), introduced by Asomaning and Watkinson to evaluate the propensity of residual oil to form sediments, is calculated based on the information about the oil SARA fractions in the oil . Other methods have also been postulated to predict the risk of asphaltene deposition that includes asphaltene instability trend (ASIST), colloidal stability index (CSI), stability index, Sepúlveda stability criterion (SCP), oil compatibility model (OCM), among others. − Although these methods are the most widely used to distinguish very stable oils from very unstable ones, experience over the past years has shown that predictions tend to be somewhat pessimistic, indicating asphaltene precipitation in cases where no problems develop in the field.…”

Section: Introductionmentioning

confidence: 99%

Method for Judging the Stability of Asphaltenes in Crude Oil

et al. 2020

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The colloidal instability index (CII) has been widely used for testing the stability of asphaltenes as a classical method. In this study, five oil samples were tested by the CII method; the results obtained greatly differ from the real field results. In our investigation, we combined the Turbiscan LAB stability analyzer and saturate, aromatic, resin, and asphaltene (SARA) analysis to further investigate the asphaltene stability by heptane titration. The results revealed that there exists a threshold volume ratio before the asphaltenes destabilize. The stability of crude oil is related to the saturation solubility of asphaltenes. By testing the CII value of the crude oil in its current state and the CII value of the dissolved asphaltenes in its saturated state, we were able to propose a new way to judge the oil stability.

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Section: Introductionmentioning

confidence: 99%

Method for Judging the Stability of Asphaltenes in Crude Oil

et al. 2020

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“…Based on practical experience, there is a clear link between compatibility as measured using titration techniques and fouling in heat exchangers. − Blending effects on fouling have been investigated for crude oils regarding their compatibility . In particular, it seems that the initial fouling rate could be correlated with the CII and that the addition of a crude oil with high solvent power can significantly decrease fouling even if added in small amounts .…”

Section: Introductionmentioning

confidence: 99%

“…12−15 Blending effects on fouling have been investigated for crude oils regarding their compatibility. 16 In particular, it seems that the initial fouling rate could be correlated with the CII and that the addition of a crude oil with high solvent power can significantly decrease fouling even if added in small amounts. 17 Besides compatibility, other characteristics of the crude oils are also linked to fouling and can be acting synergistically with asphaltene insolubility to accelerate fouling.…”

Section: ■ Introductionmentioning

confidence: 99%

Evaluation of the Compatibility of Crude Oil Blends and Its Impact on Fouling

et al. 2018

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The effect of the blending of crude oils on fouling propensity was investigated to determine the extent to which compatibility of crude oils influences fouling. In this study, fouling testing was performed for a series of crude oil blends with diverse compatibility as measured using a titration method. After testing, fouling deposits were recovered and analyzed. For the studied blends, the results show that compatibility is the driving force for fouling propensity. Asphaltene and inorganic contents also play a significant, but secondary role in the fouling of these samples. Filtration and temperature effects were also evaluated for some of the blends. As expected, temperature decreases fouling propensity, while filtration has a low impact indicating that, for the studied blends, fouling is temperature dependent and not driven by the presence of suspended inorganic particles. A correlation is proposed to describe the fouling propensity based on compatibility measurements of the blends at room temperature. The analysis of the deposits revealed correlations between deposit composition and blend characteristics. In particular, soot formation during fouling seems to be related to micro carbon residue in the blends. It was also found that infrared measurements can be used to estimate the formation of carbonaceous materials in the deposits. The presence of long paraffins in the deposit could have a large impact on fouling propensity and might indicate that the interaction between paraffins and asphaltenes persists even at high temperatures. The results demonstrate that compatibility measurements using titration techniques can be successfully used to minimize fouling by optimizing concentrations of the components of a specific blend.

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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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Experimental Setups for Studying the Compatibility of Crude Oil Blends under Dynamic Conditions

Cited by 15 publications

References 47 publications

Method for Judging the Stability of Asphaltenes in Crude Oil

Method for Judging the Stability of Asphaltenes in Crude Oil

Evaluation of the Compatibility of Crude Oil Blends and Its Impact on Fouling

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

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