On the mechanism of a helical motion of fluids in regions of sharp path bending

Mingaleeva, G. R.

doi:10.1134/1.1505541

Cited by 13 publications

(5 citation statements)

References 2 publications

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“…The principle of vortex drainage is: The down hole gasliquid mixing fluid enters into the helical annular space formed by the wellbore with the vortex tools, which makes fluid accelerate and rotate. Due to the effect of centrifugal force, most of the denser liquid fluid flows upward at high speed spirally along the well wall while the gas flows upward in the center of the wellbore, which effectively improves liquid density gradient distribution [5]. Irregular and inefficient gas-liquid mixing turbulent fluid is converted into the regular vortex fluid by vortex tools.…”

Section: Structure and Principlementioning

confidence: 99%

Numerical Simulation Research of the Influencing Factor of Vortex Tool Drainage Gas Recovery Technology

Wang¹,

Dong²,

Sun³

et al. 2015

TOPEJ

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The problem of effusion in gas well bottom hole grows increasingly serious in the late exploitation of gas field. The technology of vortex drainage has good prospects because the tool is conveniently manufactured and environmentally friendly. Currently, the mechanism for the vortex drainage and the theory of fluid motion are still missing. Therefore, in order to further realize the flow field of bottom hole, verify drainage mechanism and optimize working conditions, the study established a three-dimensional structural model of vortex tools to simulate the progress of gas well drainage by using the CFD software Fluent. By monitoring the liquid content of wellhead, liquid’s radial distribution, observing the flowing state of gas-liquid and the path line, analyzes the influence of gas production rate, liquid producing capacity of wells and the main structure parameters of vortex tools (the length of the pitch of the helical blade and screw) on gas well flow field. The study revealed the working mechanism of vortex tools to facilitate the understanding of the nature of the vortex drainage process, guided the field how to select the preferred process conditions and provides the basis for optimizing the structure and provide theoretical basis for the application and the dynamic simulation of vortex drainage technology.

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Section: Structure and Principlementioning

confidence: 99%

Numerical Simulation Research of the Influencing Factor of Vortex Tool Drainage Gas Recovery Technology

Wang¹,

Dong²,

Sun³

et al. 2015

TOPEJ

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“…Therefore, U.S. and China adopt vortex tools in liquid-loading gas wells in succession. Mingaleeva (2002) found that the minimum pressure loss can be obtained when the gasliquid fluid moves upward in vortex flow regime. Based on this theory, the downhole vortex tool in gas well was designed to decrease the pressure drop along the wellbore.…”

Section: Introductionmentioning

confidence: 98%

Study on the gas–liquid annular vortex flow for liquid unloading of gas well

Shi¹,

Wu²,

Han³

et al. 2019

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Vortex tool is a new technique for the liquid unloading in gas wells. But it lacks a mathematical model to describe and predict the effect of vortex tools. In the present work, according to the axial, radial and circumferential momentum balance of the gas phase and liquid phase, the governing equations of vortex flow model have been established. Then thickness of liquid film and gas and liquid vortex flow intensity as well as the pressure drop gradient can be calculated. The calculation results and the previous experiments indicate that the pressure drop of the gas–liquid flow can be reduced by 5% ~ 25% with the vortex tool, and the vortex flow model has an average relative difference of 6.01%. The model results show that there are two mechanisms for reducing the pressure drop under the vortex flow condition. In addition, the research results show that vortex tools with bigger helical angle will lead to higher vortex flow intensity. The decay rate of vortex flow intensity decreases along the pipe as liquid velocity increases and the vortex flow working distance can be calculated by the vortex intensity gradient and initial vortex flow intensity.

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“…A substantial amount of research has been conducted worldwide since the development of the cyclone tool in 2003 by the US Department of Energy (DOE) and the demonstration of its capability to transform the flow regime and improve the efficiency of cyclone fluid extraction 5,6 . Mingaleeva found that a spirally transported fluid forms an air core in the centre and has a low‐pressure suction characteristic, which greatly reduces the loss of pressure energy during the movement 7 . Veeken and Belfroid observed that an annular film of fluid on the inner wall of the tubing as the gas–liquid two‐phase fluid flowed through the cyclone.…”

Section: Introductionmentioning

confidence: 99%

“…5,6 Mingaleeva found that a spirally transported fluid forms an air core in the centre and has a low-pressure suction characteristic, which greatly reduces the loss of pressure energy during the movement. 7 Veeken and Belfroid observed that an annular film of fluid on the inner wall of the tubing as the gas-liquid two-phase fluid flowed through the cyclone. The longer the duration of the spiral motion, the longer the film remained.…”

Section: Introductionmentioning

confidence: 99%

Performance study of self‐excited oscillatory cyclone drainage tool to improve the efficiency of natural gas well drainage and gas recovery

Liang

Jiang

et al. 2023

Asia-Pacific J Chem Eng

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The accumulation of fluid in the wellbore of a natural gas well can seriously affect the production of the well and can even lead to the well flooding and stopping production. The conventional cyclone tool has low kinetic energy, serious energy loss and short effective distance of spiral flow in the process of gas well drainage and gas recovery, thus affecting the efficiency of gas well drainage and gas recovery. In response to the above problems, this paper proposes a new cyclonic drainage solution combining self‐excited oscillating pulse jet and cyclonic flow. The liquid‐carrying air flow through the oscillating chamber forms a large vortex ring and the flow pattern squeezes the central air flow inwards, allowing the return vortex at the wall to develop effectively, increasing the return vortex velocity and increasing the velocity at the centre of the squeezed pulsating flow. In this paper, based on theoretical analysis and experimental research, the numerical simulation results are compared with the various drainage performance of conventional cyclone tools. The results show that the pressure drop and critical fluid‐carrying velocity of the cyclone section are significantly reduced, and the average tangential velocity of the cyclone section and the effective action distance of the cyclone tool are significantly increased, indicating that the new cyclone tool can improve the fluid‐carrying capacity of gas wells by changing the flow pattern of the gas–liquid medium without increasing energy consumption.

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On the mechanism of a helical motion of fluids in regions of sharp path bending

Cited by 13 publications

References 2 publications

Numerical Simulation Research of the Influencing Factor of Vortex Tool Drainage Gas Recovery Technology

Numerical Simulation Research of the Influencing Factor of Vortex Tool Drainage Gas Recovery Technology

Study on the gas–liquid annular vortex flow for liquid unloading of gas well

Performance study of self‐excited oscillatory cyclone drainage tool to improve the efficiency of natural gas well drainage and gas recovery

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