Performance evaluation of a multi-branch gas–liquid pipe separator using computational fluid dynamics

Refsnes, Helene Sund; Díaz, Mariana; Stanko, Milan

doi:10.1007/s13202-019-0708-8

Cited by 4 publications

(5 citation statements)

References 11 publications

(8 reference statements)

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“…The liquid holdup that existed during the critical ZNLF is called critical ZNLF holdup. By grouping some of the critical ZNLF holdup, a trend was realised that agreed with existing data by Kouba et al, and Apardi et al, that is: the critical ZNLF holdup decrease with increasing separator inlet superficial gas velocity [4,6]. Additionally, it was found that the critical ZNLF holdup increases with increasing separator inlet superficial liquid velocity.…”

Section: Resultssupporting

confidence: 81%

“…Liquid holdup under ZNLF for a stagnant liquid condition was measured using electrical resistance tomography. The trend of present data of ZNLF holdup under stagnant liquid condition agrees with that reported by Kouba et al, [4] and Apardi et al, [6]. However, quantitatively, their data are not comparable with the present data, as the effect of inlet liquid flow on ZNLF was not considered in their work.…”

Section: Resultssupporting

confidence: 63%

“…The proposed correlation agreed with 70% of the non-critical ZNLF holdup data with 20% error margin. The prediction of the experimental data by the proposed correlation compared to the model by Arpandi et al, did not match quantitatively but showed a similar trend [4].…”

Section: Resultsmentioning

confidence: 69%

“…Gas-liquid compact separator designed to operate based on the cyclonic separation principle is now gaining momentum in the petroleum industry, especially in situations where equipment weights and installation space are design constraints. A good example of such a situation includes subsea separation, offshore production platforms, downhole separation, metering skids, well-testing, and underbalanced drilling [1][2][3][4][5]. However, these compact separators suffer the disadvantage of a narrow operating envelope for liquid carryover (LCO).…”

Section: Introductionmentioning

confidence: 99%

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An Empirical Correlation for Zero-Net Liquid Flow in Gas-Liquid Compact Separator

Kanshio¹

2019

AJCHE

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Compact separators have significant application for subsea separation and offshore application. However, their operating envelope is usually narrow due to physical phenomena such as liquid carryover and gas carry-under. Before the occurrence of liquid carryover, the separator operates in what is termed zero-net liquid flow (ZNLF). Though there is an efficient separation during ZNLF; there is also liquid holdup in the upper section of the separator, which is termed as ZNLF holdup. The ZNLF holdup in a cyclonic separator during an actual gas-liquid separation was studied experimentally. The ZNLF holdup was measured directly using electrical resistance tomography (ERT). The direct measurement approach is an improvement of the existing method, which depends on measuring the pressure drop across the stagnant liquid column. The results showed that increasing gas flow rate at a constant liquid flow rate increase zero-net liquid holdup in the upper part of the separator. An empirical correction was developed, and the correlation predicted the experimental results with a ±10% error margin. The correlation could be useful as part of the input into a pressure drop model for calculating pressure drop across the gas leg of the cylindrical cyclonic separator. This correlation will be useful to process engineers for optimum design and operation of a gas-liquid compact separator.

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Section: Resultssupporting

confidence: 81%

Section: Resultssupporting

confidence: 63%

Section: Resultsmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

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An Empirical Correlation for Zero-Net Liquid Flow in Gas-Liquid Compact Separator

Kanshio¹

2019

AJCHE

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“…The curve increases gently at first, then rises rapidly, then increases slowly and then reaches a peak and begins to decline in a symmetrical form. This model is more suitable for predicting the growth law of natural gas reserves with relatively gentle changes (Mfoubat and Zaky 2019;H Refsnes., Diaz M., Stanko M. 2019).…”

Section: Gauss Model Of Natural Gas Reserves Predictionmentioning

confidence: 99%

Studies on natural gas reserves multi-cycle growth law in Sichuan Basin based on multi-peak identification and peak parameter prediction

Fang

et al. 2021

J Petrol Explor Prod Technol

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Research on predicting the growth trend of natural gas reserves will help provide theoretical guidance for natural gas exploration in Sichuan Basin. The growth trend of natural gas reserves in Sichuan Basin is multi-cycle and complex. The multi-cyclic peak is screened by the original multi-cyclic peak judgment standard. Metabolically modified GM(1,3) gray prediction method is used to predict the multi-cycle model parameters. The multi-cycle Hubbert model and Gauss model are used to predict the growth trend of natural gas reserves. The research results show that: (1) The number of cycles of natural gas reserves curve during 1956–2018 is 13. Natural gas reserves will maintain the trend of rapid growth in the short term. (2) Metabolism modified GM(1,3) gray prediction model can improve the accuracy of model prediction. The prediction accuracy of Hubbert model is higher than that of Gauss model. By 2030, the cumulative proven level of natural gas will reach 52.34%. The Sichuan Basin will reach its peak of proven lifetime reserves in the next few years.

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Performance evaluation of downhole oil–water separators in wells that use DWL technique using computational fluid dynamics: influence of velocities and flow rates

Buhamad

Dehaghani

2023

J Petrol Explor Prod Technol

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A major issue in many oil fields is the production of undesirable water from oil wells. One of the most important causes of unwanted water is water coning. This phenomenon may be leading to a decreasing oil production rate, an increasing water cut, and consequently high production costs. Downhole water loop (DWL) is a relatively new and effective technique to control water coning. Even though many studies have shown how effective the DWL approach is in reducing the problem of water cones, the issue of oil droplets escaping the drainage zone might damage the injection area and perhaps cause blockage. It is suggested to use the downhole oil–water separator (DOWS) approach to separate oil droplets from the water stream based on the difference in densities. This article gives a numerical analysis of DOWS in two stages. In order to confirm that the simulator could faithfully simulate this sort of separator, the findings of the employed simulator were first compared with the preceding analytical solutions. Then the impact of inlet velocities and flow rates was discussed numerically for seven scenarios in the second stage. The results showed that a high inlet velocity encourages the formation of oil droplets as a result of the mixture stream colliding with the separator walls, whereas a low inlet velocity produced undesirable results because the oil droplets remained dispersed in the water stream (the separation efficiency was 30.6% less than the high-velocity condition). In the following case, a novel design based on expanding the mixture input area and changing the mixture inlet and outlet points was presented to lessen the impact of mixture inlet velocity. The separation efficiency was improved by 38.65% as a result of this approach. Finally, the discussion's findings about the effect of mixture flow rates at the separator's inlet and upper outlet showed that the inlet rate has a bigger impact on separator performance than the upper outlet rate. The outcomes of this research and the numerical models can be utilized to enhance the system-level design, better understand this kind of separator, and increase its efficacy.

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Performance evaluation of a multi-branch gas–liquid pipe separator using computational fluid dynamics

Cited by 4 publications

References 11 publications

An Empirical Correlation for Zero-Net Liquid Flow in Gas-Liquid Compact Separator

An Empirical Correlation for Zero-Net Liquid Flow in Gas-Liquid Compact Separator

Studies on natural gas reserves multi-cycle growth law in Sichuan Basin based on multi-peak identification and peak parameter prediction

Performance evaluation of downhole oil–water separators in wells that use DWL technique using computational fluid dynamics: influence of velocities and flow rates

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