Study on the migration of gas kicks in undulating sections of horizontal wells

Gao, Yonghai; Sun, Xiaohui; Zhao, Tianyu; Wang, Zhiyuan; Zhao, Xinxin; Sun, Baojiang

doi:10.1016/j.ijheatmasstransfer.2018.07.156

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…Gao et al [10] analyzed the gas migration process in the undulating section of a horizontal well through experiments. In order to verify the correctness of the simulation results, the simulation results were compared with their experimental results.…”

Section: Experimental Comparison and Verificationmentioning

confidence: 99%

“…Hibiki and Ishii proposed a drift velocity equation; it is applied to slug flow [9]. Gao et al simulated the storage and removal processes of the gas slug by experiments and analyzed the migration of the gas slug [10]. In recent years, the drift speed equation proposed by Woldesemayat and Ghajar considers the influences of surface tension and pipeline diameter on drift speed apart from the influences of pipeline direction and system pressure [11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Investigation on Gas Accumulation and Gas Migration in the Wavy Horizontal Sections of Horizontal Gas Wells

Huang

Yang

Meng

et al. 2020

Mathematical Problems in Engineering

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Wavy horizontal sections are typically encountered in horizontal gas wells, which will result in gas accumulation on top of the wavy horizontal sections. This gas accumulation can be a problem and may trigger gas kick or blowout accident while tripping and pulling this gas into the vertical section. In this paper, a numerical model for gas accumulation and gas migration in the wavy horizontal sections of the horizontal gas well is developed; meanwhile, the gas accumulation and gas migration process is numerically investigated. The results show that the gas exhausting time in the wavy horizontal section increases with the increase of the wellbore curvature and the critical drilling fluid flow velocity for gas exhausting increases with the increase of the wellbore curvature. When the drilling fluid flow velocity is higher than the critical drilling fluid flow velocity for gas exhausting, no gas accumulation will occur. With all other parameter values set constant, the number of the wavy horizontal sections has a great effect on the gas-liquid flow pattern while it has little effect on the efficiency of the gas exhausting. This work provides drilling engineers with a practical tool for designing the drilling fluid flow velocity to avoid gas kick or blowout accident in horizontal gas well drilling.

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Section: Experimental Comparison and Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Gas Accumulation and Gas Migration in the Wavy Horizontal Sections of Horizontal Gas Wells

Huang

Yang

Meng

et al. 2020

Mathematical Problems in Engineering

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show abstract

“…In engineering applications, such as absorption, distillation, flotation, and gas cut during well drilling, all the gas-liquid interactions occur in the latter form. The hydraulic characteristics and flow regimes of the gas-liquid system are affected by the physical and chemical properties of the liquid phase (such as viscosity, surface tension, and density) and by the characteristic parameters of the dispersed phase (such as bubble size and bubble rising velocity and among others) [8][9][10][11][12][13]. The characteristics of a bubble in the liquid phase, the different flow regimes, and the distribution of the flow field of the liquid under the effect of bubble movement are helpful for the indepth understanding of the transfer process during gas-liquid contact and have been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of Gas Bubble Formation and Escape in Non-Newtonian Drilling Fluids

et al. 2021

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In this study, the formation and escape movements of a bubble injected in non-Newtonian drilling fluid through a pore were numerically simulated using a volume of fluid method. The pattern of a single bubble and the pressure and velocity fields of the surrounding liquid phase during the bubble formation were analyzed and compared with experimental results; based on the comparison, the formation and escape properties of the bubble were further studied. In particular, the effects of static shear force, consistency coefficient, and flow behavior index on the growth and escape time of the bubble were analyzed. The results show that, owing to the effect of velocity on the viscosity of a non-Newtonian drilling fluid, the escape time and volume of the bubble increase with an increase in static shear force, consistency coefficient, and flow behavior index. Among the three parameters, the flow behavior index has the greatest effect. This is because the shear disturbance of a bubble to its surrounding fluid during its growth and escape, caused by the shear thinning of a yield-power-law fluid, reduces the fluid viscosity. The shear thinning decreases, and the resistance to the bubble increases as the flow behavior index approaches 1, leading to larger bubble formation times and separation volumes. An empirical formula for predicting the equivalent radius of bubbles considering the liquid yield stress, inertial force, viscous force, and surface tension is established. The average error of predicting the equivalent radius of detached bubble is 0.80%, which can provide a reference for the better study of bubble migration and flow pattern in non-Newtonian fluid.

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Multiphase Flow Model of Gas Hydrate Production Wellbore Based on Double-Layer Continuous Pipe

Zhang,

Li,

Yang

et al. 2023

Mechanisms and Machine Science

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Study on the migration of gas kicks in undulating sections of horizontal wells

Cited by 5 publications

References 22 publications

Numerical Investigation on Gas Accumulation and Gas Migration in the Wavy Horizontal Sections of Horizontal Gas Wells

Numerical Investigation on Gas Accumulation and Gas Migration in the Wavy Horizontal Sections of Horizontal Gas Wells

Simulation Analysis of Gas Bubble Formation and Escape in Non-Newtonian Drilling Fluids

Multiphase Flow Model of Gas Hydrate Production Wellbore Based on Double-Layer Continuous Pipe

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