Effects of oil composition on interactions between paraffinic and asphaltenic components and the performance of paraffin inhibitors

M'barki, O.; Clements, John; Salazar, Luis; Machac, James; Nguyen, Quoc P.

doi:10.1016/j.geoen.2023.211699

Cited by 4 publications

(11 citation statements)

References 34 publications

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“…Because the asphaltenic crude has a small acid value, one might expect that its electrostatic interactions with the PI would be somewhat unfavorable in dodecane, with the effect being mitigated by electrostatic shielding in oils having a greater percentage of more semipolar components such as resins. Indeed, the data exhibited such a trend with regard to a previous work involving a PI having ρ ca = 0.8 (ρ sc = 1.2) . That the data herein do not follow such a trend is perhaps due to the lower ρ ca = 0.4 (ρ sc = 1.6) of the PI employed in this investigation.…”

Section: Resultscontrasting

confidence: 40%

“…Indeed, the data exhibited such a trend with regard to a previous work involving a PI having ρ ca = 0.8 (ρ sc = 1.2). 20 That the data herein do not follow such a trend is perhaps due to the lower ρ ca = 0.4 (ρ sc = 1.6) of the PI employed in this investigation. However, we recognize that this effect is likely a minor one.…”

Section: Effect Of Oil Composition On Wax Crystallization With Pi Add...mentioning

confidence: 62%

“…18,19 The efficacies of the PI characterized by structure I and two PIs selected from the group characterized by structure II were then evaluated in oils of differing composition. This work represented an expansion of the former study to include observations in diesel and a light West Texas (WT) crude as examples of oils having increasing compositional complexity relative to dodecane, i.e., greater fractions of aromatic and resin components, respectively 20 (Table 1). Samples featuring more extensive, interconnected crystal networks tended to have higher WATs and viscosities, largely independent of other morphological features such as crystal size, shape, and regularity.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Added Asphaltenes and Paraffin Inhibitor on Wax Stability and Deposition in Oils of Varying Complexity

M’barki,

Clements,

Nguyen

2023

Energy Fuels

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Continuing our investigation into the nature of interactions between wax, asphaltenes, and paraffin inhibitors (PIs) in crude oil in order to better guide PI-based flow assurance strategies, the effects of added asphaltenes and PI separately and in combination in three different base oils containing added wax were studied by examining cross-polarization microscopy images, dynamic viscosity cooling−heating curves, and cold finger wax deposition amounts and compositional analysis. Treatments that eventuate in more solvated, less interconnected, i.e., discrete morphologies reduce oil viscosity as much as 98%. The ability of asphaltenes to function as a PI or enhance the function of a PI is greater in oils containing smaller aromatic and resin components. In many cases, treatments that lower oil viscosity also reduce the extent of paraffin deposition; however, in some cases, networks consisting of small wax crystals that do not notably impede flow nevertheless result in substantially increased wax deposition. Treatment with asphaltenes or PI appears to be governed by the morphological characteristics of wax domains rather than their composition. However, trends involving minor differences in the composition of wax deposits agree with earlier conclusions by these authors that the efficacy of PIs having higher chain densities, ρ sc , are more strongly dependent on wax chain length than those having lower ρ sc values, and that the presence of asphaltenes reduces this effect.

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Section: Resultscontrasting

confidence: 40%

Section: Effect Of Oil Composition On Wax Crystallization With Pi Add...mentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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Effects of Added Asphaltenes and Paraffin Inhibitor on Wax Stability and Deposition in Oils of Varying Complexity

M’barki,

Clements,

Nguyen

2023

Energy Fuels

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“…We postulated that the presence of semi-polar components such as resins and, to a lesser extent aromatics, mitigate this effect. The fact that this trend was not observed in the absence of asphaltenes suggests that asphaltenes are required to facilitate interactions between wax, PI, resins, and aromatics [17].…”

Section: Introductionmentioning

confidence: 97%

“…The effects of oil and wax composition on the morphological and rheological consequences of treatment with maleic anhydride-alpha olefin (MA-AO) comb copolymer paraffin inhibitors (PIs, Structure I) have been investigated [16][17][18][19]. A series of PIs were selected and their effect on wax was evaluated in a simple wax-containing dodecane-based oil.…”

Section: Introductionmentioning

confidence: 99%

Effect of Asphaltenes and Asphaltene Dispersants on Wax Precipitation and Treatment

M’barki,

Clements,

Nguyen

2024

Colloids and Interfaces

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A detailed understanding of the interactions between wax and asphaltenes with other components of crude oils and the effect of treatments with paraffin inhibitors (PIs) and asphaltene dispersants (ADs), with a focus on identifying specific structure-activity relationships, is necessary to develop effective flow assurance strategies. The morphological and rheological consequences of treating wax and asphaltenes in oils of differing composition with a series of ADs having structural features in common with an alpha olefin-maleic anhydride (AO-MA) comb-like copolymer PI were assessed alone and in combination with said PI. Of the four ADs studied, two were identified as being effective dispersants of asphaltenes in heptane-induced instability tests and in a West Texas (WT) crude. The degree to which a low concentration of asphaltenes stabilizes wax in the absence of treatment additives is lessened in oils having greater aromatic fractions. This is because these stabilizing interactions are replaced by more energetically favorable aromatic–asphaltene interactions, increasing oil viscosity. Treatment with AD alone also reduces the extent of wax–asphaltene interactions, increasing oil viscosity. In concert with the PI, treatment with the AD having greater structural similarity with the PI appears to improve wax solubility in both the presence and absence of asphaltenes. However, the viscosity of the treated oils is greater than that of the oil treated with PI alone, while treatment with AD having lesser structural similarity with the PI does not adversely affect oil viscosity. These data suggest that rather than treating both wax and asphaltenes, AD may poison the function of the PI. These data illuminate the pitfalls of designing flow assurance additives to interact with both wax and asphaltenes and developing treatment plans.

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Investigation on the condensate gas composition variation and wax deposition mechanism during temperature-induced phase transition process

Zhang,

Gu,

et al. 2024

Journal of Cleaner Production

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Effects of oil composition on interactions between paraffinic and asphaltenic components and the performance of paraffin inhibitors

Cited by 4 publications

References 34 publications

Effects of Added Asphaltenes and Paraffin Inhibitor on Wax Stability and Deposition in Oils of Varying Complexity

Effects of Added Asphaltenes and Paraffin Inhibitor on Wax Stability and Deposition in Oils of Varying Complexity

Effect of Asphaltenes and Asphaltene Dispersants on Wax Precipitation and Treatment

Investigation on the condensate gas composition variation and wax deposition mechanism during temperature-induced phase transition process

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