Toward an efficient wax precipitation model: Application of multi-solid framework and PC-SAFT with focus on heavy end characterization for different crude types

Asbaghi, Ehsan Vahabzadeh; Nazari, Farzaneh; Assareh, Mehdi; Nezhad, Mohaddeseh Mousavi

doi:10.1016/j.fuel.2021.122205

Cited by 5 publications

(2 citation statements)

References 40 publications

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“…Asbaghi et al 37 showed that a single characterization scheme is not applicable to all crudes with wax precipitation. However, it is possible to categorize the crudes based on the compositional data and wax parameters to have a primary understanding of the fluid description for modeling.…”

Section: Discussionmentioning

confidence: 99%

Application of fusion property estimation within the multisolid wax prediction model on Kazakhstani crude

Ismailova,

Abdukarimov,

Delikesheva

et al. 2023

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Precipitation of deposited wax on pipe walls is one of the complex flow assurance problems that cause a decrease and complete blockage of oil production rates by reducing the cross‐sectional area of the flow in the pipelines. In addition, surface facilities require higher energy consumption and equipment failure due to paraffin plugs. The purpose of the research is to use the assessment of melting properties in the model of multisolid (MS) forecasting of paraffin in Kazakhstani oil. This article presents the calculation and modification of the fusion properties for a certain Kazakhstani oil for the subsequent calculation of the MS model for predicting wax deposition; numerous approaches have been developed to predict and prevent the flow assurance problems in both science and industry. Most of them are based on predicting the temperature of crystallization of paraffin considering the temperature dependence of the solubility parameters of individual components in the liquid and solid phases, as well as the molar volumes of individual components. Wax deposition can occur anywhere from a reservoir to surface facilities and pipelines. One of the main limitations of the existing models is their applicability to a wide range of crude oil types, while this modified paraffin predicting model will target Kazakhstani crude oil.

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Section: Discussionmentioning

confidence: 99%

Application of fusion property estimation within the multisolid wax prediction model on Kazakhstani crude

Ismailova,

Abdukarimov,

Delikesheva

et al. 2023

Heat Trans

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“…Further research studies [20,21] involve the PC-SAFT equation of state for modeling of liquid phase behavior and the multi-solid framework to describe solid phase for predicting wax deposition.…”

Section: Materials and Methods Of Researchmentioning

confidence: 99%

The implementation of fusion properties calculation to predict wax deposition

Ismailova,

Abdukarimov,

Kabdushev

et al. 2023

EEJET

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Deposition of wax on the pipe walls is one of the complex flow assurance problems that causes a decrease and complete blockage of oil production rates by reducing the cross-sectional area of flow in the pipelines. In addition, surface facilities require higher energy consumption and failure of facilities due to wax plugging. Effective design of oil recovery processes requires an adequate prediction of the thermodynamic conditions in which wax can precipitate from crude oil, depending on the pressure, temperature, and composition of the oil. In this paper, the modified melting and pour point temperatures were presented based on the fluid description. Other fusion properties such as the enthalpy of fusion, the solid-state transition enthalpies, and the heat capacity of fusion have been calculated to modify the multi-solid model for predicting wax deposition. The proposed modified equations for melting and pour point temperatures were showing reliable agreement with experimental data based on SARA analysis and demonstrated more accurate results compare to literature data. In order to justify the proposed model, the comparative approach has been implemented between literature, experimental, and data obtained based on proposed solutions. The detailed description of the Republic of Kazakhstan’s (RoK) oil fields, components from C1 up to C36+ has been used during this research and the most crucial components which tend to form wax precipitation from C15H32 to C20H42 were plotted, which showed an increasing accuracy of 11 % for melting point temperature and 7 % for pour point temperature compared to literature data. As a result, the proposed modified solutions for fusion properties demonstrated good agreement with literature and obtained results of modifications can be used for further research on Multi solid model of wax precipitation

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