Asphaltene deposition: a survey of field experiences and research approaches

Leontaritis, Kosta J.; Mansoori, G. Ali

doi:10.1016/0920-4105(88)90013-7

Cited by 347 publications

(189 citation statements)

References 8 publications

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“…For example, it has been established through this work that the ratio of asphaltenes to resins is higher in Bassrah crude (1.254) than in Bodo crude (0.756), Table 3. This finding obviously lends support that the asphaltenes/ resins ratio is not the only factor that affects the asphaltene or heavy organics deposition potential of a crude (Leontaritis and Mansoori 1988). Interplay of other parameters such as the ratio of aromatics to saturates, electrokinetics and polydispersivities might also be important.…”

Section: Introductionsupporting

confidence: 51%

“…Therefore, Bassrah crude oil with higher asph/resin ratios is more prone to heavy organic deposition. Crude oils with higher asphaltene to resin ratios are usually more prone to heavy organics deposition but this is not the only factor to be considered in evaluating the deposition potential of a crude (Leontaritis and Mansoori 1988) as shown by the result of this work.…”

Section: Resultsmentioning

confidence: 90%

“…Asphaltenes, which are highly polar compounds, could act as glue and mortar in hardening the deposits and, as a result, causing barrier to the flow of oil. Hence, this research is directed towards the determination of n-alkanes, resins and asphaltenes in various crudes as the economic implications of these problems are tremendous, considering the fact that a problem well workover for cleaning out asphaltene restrictions and restoration of well productivity could get as high as a quarter of a million dollar (Leontaritis and Mansoori 1988). The tackling of this problem is beset with a lot of shortfalls such as the unavailability of an adequate precipitation theory, lack of sufficient understanding of the process to adopt a rational approach to develop more effective dispersants and inhibitors.…”

Section: Introductionmentioning

confidence: 99%

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NAASAR procedure for quantitative assessment of n-alkanes, asphaltenes and resins in crudes

Nwadinigwe

Alumona

2014

J Petrol Explor Prod Technol

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The quantitative assessment of n-alkanes, asphaltenes and resins in five different crude oil samples: Escravos, Bonny Export, Penningston, Bodo (Nigerian crudes) and Bassrah (from Iraq) was successfully carried out using a new approach coded NAASAR, (n-alkanes, asphaltenes, aromatics and resins) comprising urea adduction followed by gas chromatographic analyses (for n-alkanes), n-heptane precipitation (for asphaltenes) and column chromatography (for resins). The results established the occurrence of n-alkanes ranging from n-C 8 H 18 to n-C 40 H 82 with total weight percentage n-alkane yields in the order: Bodo 47.41 [ Bonny Export 32.47 [ Penningston 30.75 [ Bassrah 11.22 [ Escravos 5.58. N-heptane precipitation showed that Bodo crude oil has the highest weight percent concentration of asphaltenes (7.31 %) and Bonny Export, the least (1.34 %). Bodo crude oil also has a higher percentage of resins (9.66) than Bassrah(3.77). 0 API gravity, wt % of n-alkanes, asphaltenes, resins and the ratio of asphaltenes to resins were compared in two of the crudes: Bodo and Bassrah. The asphaltenes to resins ratio is one of the key parameters that control the stability of asphaltenemisceles in crude oils. This work demonstrated that Bassrah crude has a higher asphaltenes to resins ratio than Bodo crude. NAASAR method employed in this work is cost effective because it does not require sophisticated equipment as in SARA group type of analysis (saturates, aromatics, resins and asphaltenes) according to Fan and Buckley (2002). It requires small samples of crudes and solvents and also it is a reliable means of crude oil analysis when compared with other existing methods which require the use of fairly large samples and solvents.

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Section: Introductionsupporting

confidence: 51%

Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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NAASAR procedure for quantitative assessment of n-alkanes, asphaltenes and resins in crudes

Nwadinigwe

Alumona

2014

J Petrol Explor Prod Technol

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“…The formation and deposition of asphaltene-rich, solidlike material during oil recovery operations have been well documented in the literature (7,9,17). Asphaltenes are often considered troublemakers because of their tendency to flocculation (2).…”

Section: Introductionmentioning

confidence: 99%

An Investigation into the Precipitation of Asphaltene from Maltenes Using Binary Mixtures of N-Paraffin

2017

International Journal of Petroleum and Petrochemical Engineerin

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“…[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. 6 The precipitation of asphaltenes occurs due to a number of reasons.…”

Section: Introductionmentioning

confidence: 99%

Asphaltene Precipitation Models: A Review

Subramanian

Simon

Sjöblom

2015

Journal of Dispersion Science and Technology

108

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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...

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Asphaltene deposition: a survey of field experiences and research approaches

Cited by 347 publications

References 8 publications

NAASAR procedure for quantitative assessment of n-alkanes, asphaltenes and resins in crudes

NAASAR procedure for quantitative assessment of n-alkanes, asphaltenes and resins in crudes

An Investigation into the Precipitation of Asphaltene from Maltenes Using Binary Mixtures of N-Paraffin

Asphaltene Precipitation Models: A Review

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