Numerical prediction of wax deposition in oil–gas stratified pipe flow

Duan, Jimiao; Liu, Huishu; Jiang, Junzhe; Xue, Song; Wu, Jianlin; Gong, Junbo

doi:10.1016/j.ijheatmasstransfer.2016.09.082

Cited by 17 publications

(8 citation statements)

References 41 publications

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“…The weight fraction of the components with carbon number i in the liquid phase, w L,i , cancels out Equation ( 7) divided by Equation (8).…”

Section: Modified C-htgc Methodsmentioning

confidence: 99%

“…Obviously, in order to obtain the solubility of wax in crude oil, the wax precipitation curve for different temperatures of crude oil must first be obtained. Therefore, the wax precipitation amount in crude oil is the basis for studying the wax deposition law in waxy oil pipelines; it is of great importance for the study of wax deposition [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Measurements of Wax Precipitation Using a Modified Method of Simultaneous Centrifugation and High-Temperature Gas Chromatography

Liu

Duan

et al. 2021

Energies

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Wax precipitation and deposition are serious flow assurance problems. Wax precipitation is investigated simultaneously using centrifugation and high-temperature gas chromatography (C-HTGC) to obtain the amount and component distribution of precipitated wax in artificial waxy oil and diesel at different temperatures. However, the conventional C-HTGC method gives upper measurements of the amount of precipitated wax, as it ignores wax dissolved in crude oil in the centrifugal cake. A modified C-HTGC method was developed to obtain the precipitated solid fraction of crude oil, based on the mass balances of the non-crystallized fraction of the centrifuged cake. The weight, percent and carbon number distribution of precipitated solid wax crystals at different temperatures of artificial oil and 0# diesel were obtained. It was found that wax precipitation characteristics are affected by many factors, including the carbon number distribution of the oil, the sensitivity of alkane crystallization to temperature and the temperature of the waxy oil solution. The average carbon number of alkanes in precipitated wax crystals decreases with the decrease in temperature. The distribution of alkanes in solid wax crystals is roughly the same as that in 0# diesel but slightly heavier than in diesel. Alkanes with high carbon numbers precipitate simultaneously with those with low carbon numbers.

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“…The weight fraction of the components with carbon number i in the liquid phase, w L,i , cancels out Equation ( 7) divided by Equation (8).…”

Section: Modified C-htgc Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Measurements of Wax Precipitation Using a Modified Method of Simultaneous Centrifugation and High-Temperature Gas Chromatography

Liu

Duan

et al. 2021

Energies

Self Cite

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“…Based on the classical gas–liquid two-phase wax deposition model, in recent years, Duan et al ,,, performed in-depth research on this problem. Based on the molecular diffusion and shear peeling mechanism, the author established an oil–gas stratified flow model and conducted a unidirectional fully developed flow analysis of momentum, heat transfer, and mass transfer: where δ is the thickness (m), ρ dep is the density of deposit (kg/m 3 ), R is the inner radius of pipe (m), and t is the time (s).…”

Section: Wax Deposition Characteristics In Two-phase Flow Pipelinesmentioning

confidence: 99%

“…Currently, there have been enormous in-depth studies on the single-phase flow wax deposition process. However, for the two- and three-phase flows, because of the multiple components of the transport medium, the complex flow pattern of multiphase flows and the coupled deposition of wax–hydrate particles in the oil–gas–water three-phase flows, the research still needs to be further deepened. ,− …”

Section: Introductionmentioning

confidence: 99%

Wax and Wax–Hydrate Deposition Characteristics in Single-, Two-, and Three-Phase Pipelines: A Review

Liu

Wang

et al. 2020

Energy Fuels

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In the oil pipeline transportation system, wax deposition will reduce the effective circulation area, weaken the overall pipeline transportation capacity, and even block the pipeline, which seriously threatens the safety of the pipeline flows. In the actual production of oil fields and the transportation of oil products, except for the single-phase waxy crude oil, under most conditions, operations are performed using multiphase mixed transportation, so it is necessary to determine the wax deposition characteristics in those pipeline systems. In this Review, three new wax deposition mechanisms proposed in recent years and several typical experimental devices were summarized, the wax deposition in oil–water and oil–gas flow systems and the wax–hydrate coupling deposition in oil–gas–water flow system flows were concluded; the mathematical models were also categorized based on the three flow systems. Meanwhile, it highlighted the fact that, in the two-phase flow, because of the complexity of the flow pattern and the presence of the second interface on the wax deposition process, independent theoretical research on the mechanism of wax deposition is particularly necessary; based on this, a more-accurate wax deposition prediction model can also be developed. For the coupled deposition of wax-hydrate in the three-phase flow system, experimental instruments such as FBRM, PVM and molecular dynamics simulations could be used to study the distribution characteristics and interaction rules of wax crystals and hydrate particles from a microscopic perspective. On the other hand, the mechanism of wax crystal and hydrate coupling deposition by additives such as antiwax agents, hydrate inhibitors, antipolymerization agents, and pipeline transportation conditions can be investigated experimentally to better control the deposition process during pipeline operation and ensure the safe flow in the transportation system.

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“…In order to schedule the pigging operation properly, design engineering project effectively, and mitigate the wax deposition problem, it is necessary to predict the well temperature and wax deposit location (Wang et al 2014;Haj-Shafiei et al 2014;Duan et al 2017). In this paper, the wells of sucker rod pump in Da Qing oil field are selected as the research object, a new numerical simulation method is proposed to predict temperature field and wax deposition location based on heat-fluid coupling.…”

Section: Introductionmentioning

confidence: 99%

Prediction temperature field and wax deposition based on heat–fluid coupling method

Zhang

Sining

Wang

et al. 2018

J Petrol Explor Prod Technol

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Wax deposition can reduce flow channel, increase the resistance and decrease fluid producing intensity in oil pipelines, which bring a critical operational challenge for the oil development. The prediction of temperature field and wax deposition location is the basis in thermal washing and wax removal. In this paper, the wells of sucker rod pump in Da Qing oil field is selected as the research object, a new method is proposed to predict temperature field and wax deposition location based on heat-fluid coupling method. The regularities of temperature distribution and wax deposition location are simulated with different fluid producing intensities and moisture contents. With the migration of produced liquid, the temperature decreases from bottom to upward, while the decline rate becomes less and less. With the increase of fluid producing intensity and moisture content, the temperature is increasing and the wax deposit location becomes shallower. In contrast to the calculated and measured results, the coincidences rate distribution is in the range of 95.61-97.86%. The results have a significance to the thermal washing plan formulation.

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Numerical prediction of wax deposition in oil–gas stratified pipe flow

Cited by 17 publications

References 41 publications

Experimental Measurements of Wax Precipitation Using a Modified Method of Simultaneous Centrifugation and High-Temperature Gas Chromatography

Experimental Measurements of Wax Precipitation Using a Modified Method of Simultaneous Centrifugation and High-Temperature Gas Chromatography

Wax and Wax–Hydrate Deposition Characteristics in Single-, Two-, and Three-Phase Pipelines: A Review

Prediction temperature field and wax deposition based on heat–fluid coupling method

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