Experimental investigation of gas-liquid separation for two-phase flow within annular duct of an ESP skid

Vieira, Saon Crispim; Custódio, Diogo A.S.; Verde, William Monte; Biazussi, Jorge Luiz; Castro, Marcelo Souza de; Bannwart, Antonio Carlos

doi:10.1016/j.petrol.2020.108130

Cited by 7 publications

(8 citation statements)

References 14 publications

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“…where ρ is the density, j m is the mixture velocity, D H is the hydraulic diameter (difference between the outer and inner diameter of the annulus), g is gravity and θ is the pipe slope, 1 and 2 represents the liquid and gas phases, respectively. Vieira et al 9,10 Reynolds and FroEude mixture numbers were measured for the data presented in 21 indicating that all points were in the slug flow region, [20][21][22] as experimentally observed at almost all points.…”

Section: Experimental Separation Efficiencysupporting

confidence: 54%

“…The average separation efficiency, E, is defined as the ratio between gas flow rate at the pump intake and total gas flow rate. It was experimentally showed by Vieira, 8 and Vieira et al 9 and Vieira et al 10 that the separation efficiency can be written as a function of the Froude mixture number, Fr m , and the no-slip void fraction, λ. The mixture Froude number is provided by Equation (1) 19 and the no-slip void fraction, λ, is defined as the ratio between air volume flow rate by mixture volume flow rate, so λ = Q g /Q.…”

Section: Experimental Separation Efficiencymentioning

confidence: 99%

“…The average separation efficiency, E , is defined as the ratio between gas flow rate at the pump intake and total gas flow rate. It was experimentally showed by Vieira, 8 and Vieira et al 9 and Vieira et al 10 that the separation efficiency can be written as a function of the Froude mixture number, Fr m , and the no‐slip void fraction, λ . The mixture Froude number is provided by Equation ) 19 and the no‐slip void fraction, λ , is defined as the ratio between air volume flow rate by mixture volume flow rate, so λ = Q g / Q .

{Fr}_{m}^{2} = \frac{ρ_{1}}{ρ_{1} - ρ_{2}} \frac{j_{m}^{2}}{D_{H} g \cos ((), θ)}

where ρ is the density, j m is the mixture velocity, D H is the hydraulic diameter (difference between the outer and inner diameter of the annulus), g is gravity and θ is the pipe slope, 1 and 2 represents the liquid and gas phases, respectively.…”

Section: Experimental Separation Efficiencymentioning

confidence: 99%

“…In addition a comparison with Alhanati's 12 model was performed and is presented in Figure 3 where the cross symbols are the experimental points of Vieira 8 and Vieira et al 10 and the circles are model predictions. Alhanati 12 proposes that the separation is a function of just the no-slip void fraction and the void fraction in the intake (first two terms of Equation ( 2)), and the last term represents the deviation from the data caused by the radial slip.…”

Section: Experimental Separation Efficiencymentioning

confidence: 99%

“…One example is the ESP Skid, 2 , a Petrobras project for better profitability, that significantly lowers cash flow implications during any period of either intervention or stopped production due to pump failure. The ESP Skid is housed in the subsea downstream the Christmas tree and slightly inclined horizontally (Details of such equipment can be found in Colodette et al 3 ; Teixeira et al 4 ; Costa et al 5 ; Tarcha et al 6,7 ; Vieira, 8 ; Vieira et al 9 and Vieira et al 10 ).…”

Section: Introductionmentioning

confidence: 99%

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Modeling of gas–liquid separation inside a slightly inclined annular duct

et al. 2021

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Electrical submersible pumping (ESP) is an artificial lift system used in the petroleum industry. ESP skid is an equipment in which the pump is housed inside a pipe forming a slightly inclined annular duct through which two-phase gas-liquid flows from inlet to pump intake. Part of the gas is pulled by the pump and part is separated and flows to the equipment top. This article analyses and models the observed separation process. Experiments showed good qualitative but poor quantitative agreement with literature models. Starting from a two-dimensional drift-flux model, radial and axial slips are modeled through phases' momentum transfer, showing the importance of drag, virtual mass and Basset's forces, leading to a semi-analytical model. As there is no model for such forces for the case of annular duct in the literature, experimental data is used for closure. The proposed model produced satisfactory and physically coherent results.

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Section: Experimental Separation Efficiencysupporting

confidence: 54%

Section: Experimental Separation Efficiencymentioning

confidence: 99%

“…The average separation efficiency, E , is defined as the ratio between gas flow rate at the pump intake and total gas flow rate. It was experimentally showed by Vieira, 8 and Vieira et al 9 and Vieira et al 10 that the separation efficiency can be written as a function of the Froude mixture number, Fr m , and the no‐slip void fraction, λ . The mixture Froude number is provided by Equation ) 19 and the no‐slip void fraction, λ , is defined as the ratio between air volume flow rate by mixture volume flow rate, so λ = Q g / Q .

{Fr}_{m}^{2} = \frac{ρ_{1}}{ρ_{1} - ρ_{2}} \frac{j_{m}^{2}}{D_{H} g \cos ((), θ)}

Section: Experimental Separation Efficiencymentioning

confidence: 99%

Section: Experimental Separation Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling of gas–liquid separation inside a slightly inclined annular duct

et al. 2021

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Rigorous review of electrical submersible pump failure mechanisms and their mitigation measures

Fakher

Khlaifat

Hossain

et al. 2021

J Petrol Explor Prod Technol

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Artificial lift is a vital part of the life of many oil wells worldwide. Using several artificial lift methods can prolong the life of the wells and increase oil recovery significantly. One of the most applied artificial lift methods nowadays is the electrical submersible pump (ESP). This artificial lift method has the ability to handle large volumes of hydrocarbons and is applicable under many conditions in both offshore and onshore reservoirs. Even though ESP has been applied extensively for many years, it still suffers from many failures due to electrical, mechanical, and operational problems associated with the ESP downhole assembly. Understanding the main reasons behind ESP failures and how to rapidly and effectively avoid and mitigate these failures is imperative to reduce cost and damage and improve operational and rig-personal safety. This research performs a comprehensive review on ESP failure mechanisms and analyzes these failures in order to determine the optimum conditions to operate the ESP. This can help minimize and avoid these failures. Also, should these failures occur, the research proposes several mitigation methods for each failure based on analysis of different field cases worldwide.

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