Determination of the Onset of Asphaltene Precipitation by Visible Ultraviolet Spectrometry and Spectrofluorimetry

Mansur, Cláudia R. E.; Guimarães, Aline R. S.; González, Gaspar; Lucas, Elizabete F.

doi:10.1080/00032710903243612

Cited by 19 publications

(14 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They showed that plotting the derivative of light absorbance with respect to volume fraction of precipitant versus volume fraction of precipitant provides a more precise value of asphaltene precipitation onset. Mansur et al (2009) used visible ultraviolet spectroscopy to observe the onset of asphaltene precipitation. Some investigators also measured turbidity value of crude oil system to determine onset of asphaltene precipitation.…”

Section: Light Scattering Technique (Lst)mentioning

confidence: 99%

A review on methods of determining onset of asphaltene precipitation

Soleymanzadeh

Yousefi

Kord

et al. 2018

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

Oil industry suffers from flow assurance problems that occur both in upstream and downstream operations. One of the common flow assurance issues arises from precipitation and deposition of asphaltenes in various locations along the oil production path including near wellbore region in the reservoir, production tubing, flowlines and separation unit at the surface. Asphaltene particles precipitate out of oil continuum due to changes in temperature, pressure or composition. Such changes in operating conditions occur during different recovery processes (natural depletion, gas injection, chemical injection, etc.) as well as production and blending of different oils during transportation. There are different experimental methodologies documented in the literature that describe how to determine onset of asphaltene precipitation. In this paper, a comprehensive review is performed on all the available procedures to measure onset of asphaltene precipitation. The advantages and limitations associated with all these methods are also documented.

show abstract

Section: Light Scattering Technique (Lst)mentioning

confidence: 99%

A review on methods of determining onset of asphaltene precipitation

Soleymanzadeh

Yousefi

Kord

et al. 2018

J Petrol Explor Prod Technol

View full text Add to dashboard Cite

show abstract

“…Any further increase in the volume of n-heptane can dilute the mixture and it will cover the effect of precipitated asphaltenes. The onset values from viscometric and microscopic methods are a little bit different from each other and such results were expected since the methods are based on distinct fundamentals (Mansur et al 2009). Table 6 shows the ratio of n-heptane to oil which leads to the formation of unstable mixtures for both dead oils A and B.…”

Section: Pvt Cellmentioning

confidence: 92%

A comprehensive experimental evaluation of asphaltene dispersants for injection under reservoir conditions

2016

View full text Add to dashboard Cite

As the efficiency of dispersants with different origins is questionable for each typical oil sample, the present study provides a reproducible and reliable method for screening asphaltene dispersants for a typical asphaltenic crude oil. Four different asphaltene dispersants (polyisobutylene succinimide, polyisobutylene succinic ester, nonylphenol-formaldehyde resin modified by polyamines, and rapeseed oil amide) were prepared and their performance on two oils from an Iranian field under laboratory and reservoir conditions was studied. A thorough analysis including ash content and SARA tests was performed on the solid asphaltene particles to characterize the nature of deposits. Then a highly efficient carrier fluid, which is crucial when injecting dispersant into the wells, was selected from a variety of chemicals by comparing their solubility. In the next step, using an optical microscope, a viscometer, and a Turbiscan, the screening of dispersants under laboratory conditions was done on a mixture of dead oil and dispersant to evaluate the onset of asphaltene precipitation and its stability when titrating by a precipitant. Finally, two different mixtures of the efficient dispersants, live oil, and carrier fluid were used with the solid detection system (SDS) and the filtration method to examine their effects on the onset pressure of asphaltene precipitation and the asphaltene content of the crude oil under reservoir conditions. The results show that the combination of experimental methods used in this work could be consistently applied to screening asphaltene dispersants. Among the four different dispersants applied here, the dispersant based on nonylphenol-formaldehyde resin modified by polyamines showed the best performance on the available live oils. This chemical modified the onset pressure of asphaltene precipitation of light oil from 4300 psi to about 3600 psi and decreased the precipitated asphaltene of heavy oil by about 30 %.

show abstract

“…A thorough review on the studies on asphaltene aggregation and precipitation is provided by Jian and Tang [6]. Furthermore, the aggregation of asphaltenes has been investigated experimentally using calorimetric titration or ultraviolet-visible (UV-vis) spectroscopy [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…In other words, a certain level of aggregation is necessary for asphaltene to reach a certain size, which is subject to gravity influence and precipitation. Additionally, asphaltenes from different crude oil sources have been reported to have different precipitation behavior due to their molecular and structural differences [9].…”

Section: Introductionmentioning

confidence: 99%

“…In spite of numerous studies on asphaltene aggregation, a few of them have been dedicated to the quantitative investigation of the game-changing roles of liquid composition and asphaltene properties in this process in terms of interaction energies [9,12]. There is still a lack of a simple approach, which can fill this gap in the literature.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Liquid Composition and Asphaltene Properties on Asphaltene Aggregation Using Interaction Energies

et al. 2021

View full text Add to dashboard Cite

An interaction energy model is employed to discern the roles of liquid composition and asphaltene properties on asphaltene stability. The model determines Lifshitz-van der Waals (LW) and acid-base (AB) for two asphaltenes of A and B types with different polarities and synthetic oils with different nC 7 volume fractions. The results indicate that the liquid loses its solubility with increased nC 7 volume fraction, due to the reduction in its electron donor component. Moreover, at the very beginning of nC 7 addition, both asphaltenes show a similar resistance against aggregation, due to the similar rates of change in their LW and AB interaction energies. However, at latter stages of nC 7 addition, the two asphaltenes tend to have different precipitation propensities, which is consistent with the results of UV-vis measurements.

show abstract

Determination of the Onset of Asphaltene Precipitation by Visible Ultraviolet Spectrometry and Spectrofluorimetry

Cited by 19 publications

References 6 publications

A review on methods of determining onset of asphaltene precipitation

A review on methods of determining onset of asphaltene precipitation

A comprehensive experimental evaluation of asphaltene dispersants for injection under reservoir conditions

Impact of Liquid Composition and Asphaltene Properties on Asphaltene Aggregation Using Interaction Energies

Contact Info

Product

Resources

About