Revisiting the methodology for asphaltenes precipitation

Santos, Danielle Freitas; Amaral, Monique; Filho, Elvio B.M.; Dourado, Raul Silva; Coutinho, João A. P.; Borges, Gustavo R.; Franceschi, Elton; Dariva, Cláudio

doi:10.1016/j.petrol.2019.03.074

Cited by 19 publications

(10 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among those, asphaltenes are the one insoluble in n -alkanes, such as n -heptane or n -pentane, and are soluble in toluene. Asphaltenes obtained using pentane is C 5 -asphaltenes, and the one using heptane is C 7 -asphaltenes. − The difference between these two asphaltene outcomes is that pentane precipitates out part of resins, which are also known to alter surface wettability due to its polarity, but not as much as asphaltenes. , IP 143 or ASTM D2007 are commonly used standard methods to separate asphaltenes from crude oil. , Maltenes used in this study were kindly provided by O. Mullins at Schlumberger-Doll Research Center. They followed these standard protocols to remove the C 7 -asphaltenes, which do not contain resins, by mixing n -heptane with Kuwait UG8 crude oil, and the n -heptane solvent was then evaporated to obtain the maltene fraction.…”

Section: Methodsmentioning

confidence: 99%

“…7,21 IP 143 22 or ASTM D2007 23 are commonly used standard methods to separate asphaltenes from crude oil. 24,25 Maltenes used in this study were kindly provided by O. Mullins at Schlumberger-Doll Research Center. They followed these standard protocols to remove the C 7 -asphaltenes, which do not contain resins, by mixing n-heptane with Kuwait UG8 crude oil, and the nheptane solvent was then evaporated to obtain the maltene fraction.…”

Section: ■ Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Hydroxyl and Carboxyl Functional Groups on Calcite Surface Wettability Using Atomic Force Microscopy and Density Functional Theory

Kim

Marcano

Becker

2021

ACS Earth Space Chem.

View full text Add to dashboard Cite

Surface-active compounds, primarily in asphaltene fractions of crude oil, are responsible for binding the nonpolar oil components to mineral surfaces and, therefore, control wettability changes on reservoir rock/mineral surfaces. Surface wettability changes occur mainly through polar functional groups in these compounds, such as hydroxyl, carboxyl, or carbonyl. By using crude oil with its asphaltene fraction removed, so-called maltenes, we investigate the effect of hydroxyl and carboxyl functional groups on wettability changes of calcite surfaces. Atomic force microscopy (AFM) images show significantly increased adsorption of maltenes on calcite samples treated with two asphaltene surrogates (phenol with a hydroxyl group and benzoic acid with a carboxyl one) than that on water-treated samples. However, the adsorbate patterns are different between those two asphaltene surrogates, suggesting different aggregation mechanisms. In addition, we observed the formation of larger surface-adsorbed droplets on the phenol or benzoic acid-treated calcite samples even for relatively short exposure times (<30 min) to maltenes. Quantum-mechanical calculations show more favorable adsorption for benzoic acid onto the calcite surface both on terraces and step edges. However, when a model oil molecule adsorbs onto those two preadsorbed asphaltene surrogates, nonpolar oil molecules preferentially adsorb onto phenol on terrace sites and benzoic acid on step edges. Overall, benzoic acid changes the calcite surface wettability more significantly than phenol.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: ■ Methodsmentioning

confidence: 99%

Effects of Hydroxyl and Carboxyl Functional Groups on Calcite Surface Wettability Using Atomic Force Microscopy and Density Functional Theory

Kim

Marcano

Becker

2021

ACS Earth Space Chem.

View full text Add to dashboard Cite

show abstract

“…The method used to deposit the asphaltenes particles from crude oil is called "standard direct experimental" method. This method follows the modified ASTM 2007/ASTM D6560 standard procedure [13,14]. Once the solvent and the crude oil were mixed together according to the desired dilution ratio, the resulted mixture was then placed in a water bath at room temperature and left for 3 h under agitation condition.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Asphaltenes Deposition Inhibition Factors in Heavy Crude Oil Pipelines

Husin¹,

Elhaj²,

Wood³

2019

Processing of Heavy Crude Oils - Challenges and Opportunities

View full text Add to dashboard Cite

Asphaltenes deposition is considered as Achilles's heel in the oil industry. The nucleation, precipitation and deposition of asphaltenes reduce the production rate significantly in affected wells and sometimes it can completely block the flow by plugging the flowlines, tubing and process facilities, in severe cases. This chapter evaluates the extrinsic and the intrinsic (thermodynamic) factors within the heavy crude oil production system. The main consequences of asphaltenes deposition are discussed such as the solvent-to-crude oil dilution ratio, crude oil physical properties (cloud point, pour point and API gravity), chemical solvent type (carbon number, functional group), agitation time and temperature changes. This chapter is expected to become the means for understanding the factors affecting the asphaltenes nucleation, precipitation and deposition.

show abstract

“…Owing to the increase in world energy demand, the oil industry has expanded its exploration to unconventional oils, such as the Brazilian pre-salt reserves. 1 From these less known basins, comprehensive geochemical assessments of the depositional environment have been performed using their oil and rock source samples. These works have corroborated the idea that the oils from these unconventional basins were generated under different environmental conditions during the deposition of source rocks.…”

Section: Introductionmentioning

confidence: 99%

Lacustrine versus Marine Oils: Fast and Accurate Molecular Discrimination via Electrospray Fourier Transform Ion Cyclotron Resonance Mass Spectrometry and Multivariate Statistics

et al. 2020

View full text Add to dashboard Cite

The ionizable molecular composition of 36 lacustrine oil samples and 29 marine oil samples from different off-shore Brazilian basins have been screened by ultrahigh-resolution and accuracy Fourier transform ion cyclotron resonance mass spectrometry with electrospray ionization in the negative-ion mode [ESI(−)-FT-ICR MS]. The negative mode has been demonstrated successfully to characterize source rock because it favors the detection of heteroatomic compounds such as nitrogen-, sulfur-, and oxygen-containing (NSO), which reveal information about geochemical environmental. ESI(−)-FT-ICR MS data was processed with a new approach that unifies information from the chemometrics tool and petroleomics conventional data processing. Novel diagrams were proposed that use variable important to projection (VIP), such as molecular formula obtained, via partial leastsquare discriminant analysis (PLS-DA) to plot in diagrams, such as those that display double bond equivalence (DBE) versus number carbon atom (NCA) and H/C ratio versus molecular mass (MM) trends. This new approach is advantageous since it is able to verify and compare all samples at once, obtaining more selective variables, such as molecular formula, and with more confidence because the figures of merit are acquired by statistical tests from PLS-DA, whereas it also provides the usual information from petroleomics tools such DBE, NCA, H/C ratio, MM, and molecular classes. This new approach revealed significant differences in the molecular distribution of heteroatomic components for N-containing and O-containing molecules (N class and O class) allowing a clear separation of all samples in two groups of marine or lacustrine crude oils.

show abstract

Revisiting the methodology for asphaltenes precipitation

Cited by 19 publications

References 48 publications

Effects of Hydroxyl and Carboxyl Functional Groups on Calcite Surface Wettability Using Atomic Force Microscopy and Density Functional Theory

Effects of Hydroxyl and Carboxyl Functional Groups on Calcite Surface Wettability Using Atomic Force Microscopy and Density Functional Theory

Evaluation of Asphaltenes Deposition Inhibition Factors in Heavy Crude Oil Pipelines

Lacustrine versus Marine Oils: Fast and Accurate Molecular Discrimination via Electrospray Fourier Transform Ion Cyclotron Resonance Mass Spectrometry and Multivariate Statistics

Contact Info

Product

Resources

About