Experimental investigation and thermodynamic modeling of asphaltene precipitation

Behbahani, Taraneh Jafari; Ghotbi, Cyrus; Taghikhani, Vahid; Shahrabadi, Abbas

doi:10.1016/j.scient.2011.11.006

Cited by 46 publications

(23 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The molecular structure of n-alkanes has a strong effect on both the yield and the physicochemical properties of precipitated asphaltene. As the carbon number increases, the weight percentage of precipitated asphaltene decreases, as previously reported in the literature (Sabeti et al, 2015;Tavakkoli et al, 2014;Behbahani et al, 2011;Mohamed and Ramos, 1999). For this reason and also due to the fact that n-C 7 is denser and more viscous than n-C 6 , which also affects the aggregation rate, it is possible to guarantee that n-C 6 precipitates more asphaltenes than n-C 7 .…”

Section: Asphaltene Precipitation From Model Oilsupporting

confidence: 66%

Thermodynamic Analysis and Modeling of Brazilian Crude Oil and Asphaltene Systems: An Experimental Measurement and a Pc-Saft Application

Neuhaus

Nascimento

Moreira

et al. 2019

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

Asphaltenes represent the heaviest fraction of crude oils, being recognized by their tendency to self-associate and precipitate. Asphaltene precipitation and subsequent deposition can cause problems in all stages of production. The objective of this paper is to model Brazilian crude oil and asphaltene systems using the PC-SAFT equation of state. Asphaltenes were extracted from crude oil through the addition of different n-alkanes. The PC-SAFT was capable of accurately predicting liquid density for toluene and asphaltenes and boiling point elevation for crude oil at different concentrations of toluene. Asphaltene precipitation from model oil allowed us to evaluate the influence of binary interaction parameters on modeling results. The influence of precipitant agent (n-hexane and n-heptane) on the asphaltene phase behavior was analyzed, showing that n-hexane was able to precipitate more asphaltenes than n-heptane, as expected. Furthermore, simulated results are in agreement with experimental observations: the average relative errors are 3.75 % and 10.25 % for the weight percentage of precipitated asphaltene using n-hexane and n-heptane as precipitant, respectively.

show abstract

Section: Asphaltene Precipitation From Model Oilsupporting

confidence: 66%

Thermodynamic Analysis and Modeling of Brazilian Crude Oil and Asphaltene Systems: An Experimental Measurement and a Pc-Saft Application

Neuhaus

Nascimento

Moreira

et al. 2019

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…Also, according to our previous publication [30], the asphaltene precipitation in this bottom hole live oil was calculated based on the Flory-Huggins theory.…”

Section: Asphaltene Precipitation Modelmentioning

confidence: 99%

Experimental Study and Mathematical Modeling of Asphaltene Deposition Mechanism in Core Samples

Behbahani

Ghotbi

Taghikhani

et al. 2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

Self Cite

View full text Add to dashboard Cite

and available online here Cet article fait partie du dossier thématique ci-dessous publié dans la revue OGST, Vol. 70, n°6, pp. 909-1132 et téléchargeable ici D o s s i e rOil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 70 (2015), No. 6, pp. 909-1132 Copyright © 2015, IFP Energies nouvelles > Editorial -Enhanced Oil Recovery (EOR), Asphaltenes and HydratesÉditorial -EOR «récupération assistée du pétrole», Asphaltènes et Hydrates D. Langevin and F. Baudin ENHANCED OIL RECOVERY (EOR) > HP-HT Drilling Mud Based on Environmently-Friendly Fluorinated ChemicalsBoues de forage HP/HT à base de composés fluorés respectueux de l'environnement Re´sume´-É tude expe´rimentale et mode´lisation mathe´matique du me´canisme de de´position d'asphalte`ne dans des carottes de forage -Les e´tudes expe´rimentales pre´sente´es dans ce document ont e´te´effectue´es afin de de´terminer les effets de la de´position d'asphalte`ne sur la re´duction de la perme´abilite´et de la porosite´d'e´chantillons rocheux de carbonate, de gre`s et de dolomite en utilisant un e´chantillon de pe´trole brut de fond de puits proche des conditions du re´servoir, tandis que dans la majorite´des travaux pre´ce´dents un me´lange d'huile recombine´e (me´lange de pe´trole de´gaze´et des gaz associe´s) est injecte´dans un e´chantillon de forage dans des conditions tre`s e´loigne´es de celles du re´servoir. Les effets du taux d'injection de pe´trole sur la de´position d'asphalte`ne et la re´duction de la perme´abilite´ont e´te´e´tudie´s. Les re´sultats expe´rimentaux montrent qu'une augmentation du de´bit d'injection de pe´trole peut causer une augmentation du de´poˆt d'asphalte`ne et une re´duction de la perme´abilite´. Il est aussi observeq ue, pour des de´bits d'injection plus faibles, une diminution monotone de la perme´abilite´des e´chantillons rocheux peut eˆtre obtenue en augmentant le de´bit d'injection, alors que pour des de´bits d'injection plus e´leve´s, apre`s une diminution de la perme´abilite´de la roche, une tendance a`l'augmentation est observe´e avant d'atteindre un e´tat stationnaire. Les re´sultats expe´rimentaux montrent aussi que le type de roche peut affecter la quantite´d'asphalte`ne de´pose´e, et que la de´position d'asphalte`ne est lie´e a`diffe´rents me´canismes dans les carottes de forage de gre`s et de carbonate. Il est mis en e´vidence que les me´canismes d'adsorption et de colmatage jouent un roˆle plus important dans les carottes de carbonate que dans ceux de gre`s. Ces re´sultats indiquent que les volumes de pore du pe´trole brut injecte´sont plus e´leve´s dans les e´chantillons de gre`s que dans ceux de carbonate. On peut ainsi en de´duire que trois types de de´poˆts peuvent avoir lieu durant l'injection de pe´trole brut : un de´poˆt continu pour les forages af aible perme´abilite´, un colmatage lent et progressif pour les forages a`haute perme´abilite´et un de´poˆt progressif pour les forages a`moyenne perme´abilite´. Les re´sultats expe´rimentaux indiquent ainsi qu'une augmentation de la pression de produc...

show abstract

“…The micellization model's predictions did however match well with more experimental point. Similarly, a comparison study of thermodynamic modelling based on solid model, Flory-Huggins model and PC-SAFT EoS model for Iranian crude by Behbahani et al 103 showed that the PC-SAFT EoS was able to predict more accurately the onset points of asphaltene precipitation for different solvents (n-C 5 , n-C 9 and n-C 12 ).…”

Section: Comparison Of Modelsmentioning

confidence: 98%

Asphaltene Precipitation Models: A Review

Subramanian

Simon

Sjöblom

2015

Journal of Dispersion Science and Technology

105

View full text Add to dashboard Cite

Asphaltenes are the heaviest and the most polar fraction of crude oil and are defined as a solubility class (typically soluble in toluene but insoluble in n-alkanes like n-heptane).Precipitation and deposition of asphaltenes during production, processing and transportation of oil is a major challenge faced by oil industry. Over the last thirty years, a number of different models have been proposed for predicting the onset of asphaltene precipitation and also the amount of precipitated asphaltenes. This article reviews the different models that have been proposed for predicting asphaltene precipitation either at atmospheric pressure or under depressurization. A brief summary of the different modeling approaches is presented followed by description of work done by different research groups. Our focus will be on the description of the basic assumptions underlying different models and also the ability/performance of the model to match the experimental data. Finally, a comparison of models is presented and discussed along with suggestions for improvement. Keywords:Asphaltene precipitation, Thermodynamic models, Solubility models, Equation of state models, Colloidal models INTRODUCTIONAsphaltenes are considered to represent the most polar and the heaviest components in crude oil. 1 They are a solubility class and defined as the fraction that is insoluble in n-alkane (like n-heptane) but soluble in aromatic solvents (like toluene). [2][3] The precipitation and deposition of asphaltenes during production and transport of crude oil is recognized as a serious problem in the oil industry since it can lead to formation damage, plugging of wellbores and production facilities. [4][5] Asphaltene precipitation can be encountered during primary recovery of oil as well as during enhanced oil recovery operations like miscible flooding with CO 2 or natural gas. 6The precipitation of asphaltenes occurs due to a number of reasons. These include changes in pressure, temperature, chemical composition of crude oils, acid stimulation, mixing of oil with diluents, other oil and gas components like CO 2 . 4 Heavy crudes usually have a lower tendency to give asphaltene deposition problems inspite of their higher asphaltene content.This observation is normally attributed to their higher resin content and lower saturate content. 7Asphaltenes are generally assumed to be composed of fused ring aromaticity, small aliphatic side chains and heteroatom functional groups. 8 The molecular weight of asphaltenes has been a source of controversy for a very long time. 9 It is now recognized to be close to 750 g/mol with a factor of 2 in the width of the molecular weight distribution. Solubility ApproachThe solubility models are most commonly used for predicting asphaltene precipitation. These models make use of the concept of solubility parameter and assume that petroleum crude Models based on Solution theory and Flory-Huggins theory assume that asphaltenes have homogenous structure and properties while models based on Scott-Magat theory assum...

show abstract

Experimental investigation and thermodynamic modeling of asphaltene precipitation

Cited by 46 publications

References 20 publications

Thermodynamic Analysis and Modeling of Brazilian Crude Oil and Asphaltene Systems: An Experimental Measurement and a Pc-Saft Application

Thermodynamic Analysis and Modeling of Brazilian Crude Oil and Asphaltene Systems: An Experimental Measurement and a Pc-Saft Application

Experimental Study and Mathematical Modeling of Asphaltene Deposition Mechanism in Core Samples

Asphaltene Precipitation Models: A Review

Contact Info

Product

Resources

About