Mitigating paraffin wax deposition by dispersants and crystal modifiers in flow testing

Sun, Minwei; Rezaei, Nima; Firoozabadi, Abbas

doi:10.1016/j.fuel.2022.124687

Cited by 7 publications

(3 citation statements)

References 55 publications

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“…For the selection of the NanoWT1 concentration during the flow loop test, the economic criterion has been considered, where low WT concentrations are highly recommended. , Concentrations from 40 to 500 mg·L –1 are attractive because the obtained WIE percentage is from 13 to 25%. In this sense, NanoWT1 will be employed at a dosage of 200 mg·L –1 during the inhibition process in the flow loop experiments.…”

Section: Resultsmentioning

confidence: 99%

SiO₂-Based Nanofluids for the Inhibition of Wax Precipitation in Production Pipelines

López,

Ríos,

Marín

et al. 2023

ACS Omega

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Wax deposition in high-wax (waxy) crude oil has been an important challenge in the oil and gas industry due to the repercussions in flow assurance during oil extraction and transportation. However, the nanotechnology has emerged as a potential solution for the optimization of conventional wax removal and/or inhibition processes due to its exceptional performance in the alteration of wax morphology and co-crystallization behavior. In this sense, this study aims to study the performance of two commercial wax inhibitor treatments (WT1 and WT2) on the wax formation and crystallization due to the addition of SiO 2 nanoparticles. Differential scanning calorimetry experiments and cold finger tests were carried out to study the effect of the WT on wax appearance temperature (WAT) and the wax inhibition efficiency (WIE) in a scenario with an initial temperature difference. In the first stage, the behavior of both WT in the inhibition of wax deposition was achieved, ranging in the concentration of the WT in the waxy crude (WC) oil from 5000 to 50,000 mg•L −1 . Then, NanoWT was prepared by the addition of SiO 2 nanoparticles on WT1 and WT2 for concentrations between 1000 and 500 mg•L −1 , and the performance of the prepared NanoWT was studied at the best concentration of WIT in the absence of nanoparticles. Finally, the role of the nanofluid concentration in wax inhibition was accomplished for the best NanoWT. Selected NanoWT with nanoparticle dosage of 100 mg•L −1 added to WC oil at 5000 mg•L −1 displays reductions in WAT and WIE of 15.3 and 71.6 for NanoWT1 and −2.2 and 42.5% for NanoWT2. In flow loop experiments for the crude oil at temperatures above (30 °C) and below (16 °C), the WAT value indicates an increase of 8.3 times the pressure drops when the crude oil is flowing at a temperature below the WAT value. Therefore, when NanoWT1 is added to the crude oil, a reduction of 31.8% was found in the pressure drop in comparison with the scenario below the WAT value, ensuring the flow assurance in the pipeline in an unfavorable environment. Based on the pressure-drop method, a reduction greater than 5% in the wax deposit thickness confirms the wax deposition inhibitory character of the designed NanoWT.

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Section: Resultsmentioning

confidence: 99%

SiO₂-Based Nanofluids for the Inhibition of Wax Precipitation in Production Pipelines

López,

Ríos,

Marín

et al. 2023

ACS Omega

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“…Some authors 63,64,75 refer to wax crystal modifiers as pour point depressants. Modifiers inhibit the growth of wax crystals because they reduce the ability of wax crystals to form three-dimensional structures 50,70 . As a result, the viscosity, yield strength, and pour point of waxy gels decrease, hence the name − pour point depressant (PPD) 71 .…”

Section: Problems Of Flow Assurancementioning

confidence: 99%

Advanced Research on the Production, Transportation and Processing of High Waxy Oil. A Review

Topilnytskyy,

Shyshchak,

Tkachuk

et al. 2024

ChChT

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Global demand for crude oil has grown significantly over the past two decades. However, conventional light crude oil production is declining, and more and more deposits of heavy and waxy oil, including high waxy ones, are being developed, creating new technological challenges at every level of the process, from production to transportation and refining. Among the various problems, the main one is wax deposition. Since the costs of maintenance, repair, and achieving the required low-temperature properties of commercial oil products are very high, solving this problem becomes critical. The paper discusses the existing problems of production, transportation, and refining of waxy crude oil and analyzes the methods of their solution.

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“…Studies on wax have primarily focused on wax deposition in formations, wellbores, and pipelines. − Only a few articles have reported on the effect of wax on interface stabilization, particularly its impact on the phase transformation of crude oil. The contribution of wax to interfacial stability mainly revolves around two aspects: cocrystallization and steric hindrance.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Asphaltene, Resin, and Wax Improving the Emulsification and Interfacial Properties of a High-Phase-Inversion Thin Oil

He,

Pu,

Yang

et al. 2024

Langmuir

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Nowadays, high-phase-inversion in situ emulsification technology has shown great potential in enhancing oil recovery from high-water-cut thin-oil reservoirs. However, emulsification characteristics, interfacial properties, and the mechanism of high phase inversion have not been systematically described. In this study, an emulsification experiment was conducted to investigate the effects of shear time, shear rate, and temperature on the phase inversion of thin oil. Furthermore, the influence of resin and wax on the dispersion of asphaltene was studied through microscopic morphology analysis. Interfacial tension measurement and interfacial viscoelasticity analysis were carried out to determine the interaction characteristics of asphaltene, resin, and wax at the interface. The results showed that, at 50 °C, the phase-inversion point of thin oil reached as high as 75%, and even at 60 °C, it remained at 70%. The shear time and shear rate did not affect the phase-inversion point of thin oil, while an increase in temperature led to a decrease in the phaseinversion point. Moreover, compared to the 20% phase-inversion point of base oil, the phase-inversion point increased with different proportions of asphaltene, resin, and wax. Particularly, at the ratio of asphaltene/resin/wax = 1:5:9, the phase-inversion point reached as high as 80%, indicating the optimal state. In this proportion, asphaltene aggregates exhibited the smallest and most uniform size, best dispersion, lower interfacial tension, and higher interfacial modulus. These findings provide reference and guidance for further enhancing oil recovery in medium-to-high-water-cut thin-oil reservoirs.

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Mitigating paraffin wax deposition by dispersants and crystal modifiers in flow testing

Cited by 7 publications

References 55 publications

SiO₂-Based Nanofluids for the Inhibition of Wax Precipitation in Production Pipelines

SiO₂-Based Nanofluids for the Inhibition of Wax Precipitation in Production Pipelines

Advanced Research on the Production, Transportation and Processing of High Waxy Oil. A Review

Synergistic Effect of Asphaltene, Resin, and Wax Improving the Emulsification and Interfacial Properties of a High-Phase-Inversion Thin Oil

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Mitigating paraffin wax deposition by dispersants and crystal modifiers in flow testing

Cited by 7 publications

References 55 publications

SiO2-Based Nanofluids for the Inhibition of Wax Precipitation in Production Pipelines

SiO2-Based Nanofluids for the Inhibition of Wax Precipitation in Production Pipelines

Advanced Research on the Production, Transportation and Processing of High Waxy Oil. A Review

Synergistic Effect of Asphaltene, Resin, and Wax Improving the Emulsification and Interfacial Properties of a High-Phase-Inversion Thin Oil

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Product

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SiO₂-Based Nanofluids for the Inhibition of Wax Precipitation in Production Pipelines

SiO₂-Based Nanofluids for the Inhibition of Wax Precipitation in Production Pipelines