Influence of Wellbore Hydraulics on Pressure Behavior and Productivity of Horizontal Gas Wells

Sarica, Cem; Haciislamoglu, Mustafa; Raghavan, R.; Brill, J.P.

doi:10.2118/28486-ms

Cited by 25 publications

(4 citation statements)

References 4 publications

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“…Permeability heterogeneity along a horizontal wellbore will cause a high rate of fluid inflow from the reservoir into the wellbore at high-permeability intervals, resulting in an early water break through occurring during these intervals. On the other hand, the pressure drop shows a high value at the heel of horizontal well bores [1,2], This also leads to a higher inflow rate at the heel and an early water breakthrough. The drawdown of oil by means of horizontal wells has many advantages over conventional oil recovery techniques.…”

Section: Introductionmentioning

confidence: 99%

Influence of Radial Flux Inflow Profile on Pressure Drop of Perforated Horizontal Wellbore

Abdulwahid

Kumar

Dakhil

2014

Journal of Energy Resources Technology

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In this study, the authors have attempted to present five different profiles for a uniform radial influx through a perforated wellbore. The total pressure drop is not only fric tional, accelerational and gravitational pressure drops, but also by the inflow pressure drop that is caused by the inflow through the perforation. The inflow through the well bore model affects the shear stress due to the wall friction. The influence of inflow depends on the flow regime present in the wellbore. Numerical simulations were per formed using ansys fluent 14-cfx, where the governing equations o f mass and momen tum were solved simultaneously, using the two equations of a standard k-e turbulence model. The results proved that the behavior of wall shear stress followed the shape of the radial inflow, i.e., the shear stress increased with the increase of radial flow and decreased with the decrease of radial flow. It was found that the fluid influx has increased the apparent friction factor along the horizontal wellbore, but in some cases the influx is decreased.

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Section: Introductionmentioning

confidence: 99%

Influence of Radial Flux Inflow Profile on Pressure Drop of Perforated Horizontal Wellbore

Abdulwahid

Kumar

Dakhil

2014

Journal of Energy Resources Technology

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“…These analyses confirmed previous results that the angle of the perforations 90 degrees is better than the test angles 0, 120, and 180 degrees, but it produces greater amounts of inflow through the perforations. Subsequently, others [2][3][4][5] continued their research, and they proposed different coupling models of well flow and perforation into the reservoir. However, in some case studies, only the friction component is observed to study the pressure drops across the wellbore.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of flow-through the perforations for angle perforation 180° and 90° in horizontal wellbore

Mustafa¹,

Rishak²,

Abdulwahid³

2022

Proceedings of 2nd International Multi-Disciplinary Conference Theme: Integrated Sciences and Technologies, IMDC-IST 2021, 7-9

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A numerical study is carried out on the perforation pipes with phase angles of 180° and 90° in a horizontal wellbore. To understand the effect of the above two-phase angles on the flow inside the wellbore, the CFD simulation of computational fluid dynamics is used. ANSYS FLUENT's simulation of the flow in the well has been used to calculate the pressure drop, friction factor, wall shear stress, productivity index, etc. The standard (k − 𝜀) model has been used to predict the turbulent behavior of radial flow. The conclusion showed that the overall pressure drop increase as the flow rate ratio increase which leads to an increase in the radial flow through the perforations, thereby keeping the axial flow through the pipe constant. Therefore, the percentage error of the total pressure drops for the phasing of the 180° and 90° perforations in test 5 is about 5.4 %. In addition, the main flow increases when the flow through the perforation increases, and this leads to an increase in the average of wall shear stress.

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“…It is generally accepted that the pressure drop of wellbore variable mass flow consists of friction pressure drop, acceleration pressure drop and mixture pressure drop. However, the existing studies on pressure drop of horizontal wells have concentrated on the friction pressure drop and the acceleration pressure drop of the variable mass flow in the horizontal wellbore [4][5][6][7][8][9][10][11][12][13], failing to consider the additional impact of radial inflow on the wellbore flow. Below is a brief overview of the previous research into the variable mass flow in horizontal wells.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis and numerical simulation of variable mass flow in horizontal wellbore

Wen¹,

Yang²,

Qi³

et al. 2018

IJHT

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This paper attempts to explore the variable mass flow in horizontal well from both experimental and numerical perspectives. For this purpose, a simulation model was created for single-phase liquid and gas-liquid two-phase variable mass flows in the wellbore using the FLUENT simulation software, and applied to the computational fluid dynamics (CFD) simulation of the variable mass flows in a horizontal pipe. Then, several experiments were carried out on the single phase variable mass flow in three scenarios, the unperforated horizontal pipe, the horizontal pipe with one perforation, and the horizontal pipe with two perforations. Through the analysis, the author established linear regression equations regarding the relationship of mixture pressure drops caused by the perforation-main pipe flow ratio. The main conclusions of the research are as follows: First, in both single-phase and gas-liquid two phase flows, the pressure drop across the perforation process increases with the perforationmain pipe flow ratio, under the same total flow rate. The trend is independent of the number of perforations. The simulation results agree well with the experimental data. Second, for both single-phase and gas-liquid two-phase variable mass flows, the pressure drop across the perforation process increases with the main pipe velocities, when the perforation velocities remain the same. Third, the pressure drop of the horizontal pipe with one perforation is greater than the total pressure drop of the horizontal pipe with two perforations, as long as the total single-phase fluid flow rate and the main pipe flow remain the same. The trend is exactly the opposite when the total two-phase fluid flow rate and the main pipe flow remain unchanged. Fourth, for single-phase liquid flow, the friction factor of unperforated pipe obtained by the Colebrook equation is much smaller than that calculated from the experimental data. Based on the measured data, a new friction factor of the perforated horizontal pipe was presented through data fitting. Fifth, when the total flow rate remains the same for the single-phase liquid flow, the friction factor is much higher for perforated horizontal pipe than the unperforated horizontal pipe, but the proportion of the increment is relatively small. The research findings shed valuable new light on the variable mass flow in horizontal wellbore.

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Influence of Wellbore Hydraulics on Pressure Behavior and Productivity of Horizontal Gas Wells

Cited by 25 publications

References 4 publications

Influence of Radial Flux Inflow Profile on Pressure Drop of Perforated Horizontal Wellbore

Influence of Radial Flux Inflow Profile on Pressure Drop of Perforated Horizontal Wellbore

Numerical Study of flow-through the perforations for angle perforation 180° and 90° in horizontal wellbore

Experimental analysis and numerical simulation of variable mass flow in horizontal wellbore

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