scholarly journals Transient flows in a wellbore during killing of an empty well

2019 ◽  
Vol 23 (4) ◽  
pp. 2297-2306
Author(s):  
Lin Jiang ◽  
Na Wei ◽  
An-Qi Liu ◽  
Ying-Feng Meng ◽  
Hai-Tao Li ◽  
...  
Keyword(s):  
Gas Flow ◽  
Transient Flow ◽  
High Yield ◽  
Two Phase ◽  
Transient Flows ◽  
Gas Drilling ◽  
Well Completion ◽  
Flow Through ◽  
Transient Seepage ◽  
Gas Layer

Failure to adequately equipping the wellhead with appropriate well control equipment may result in a high pressure in the gas drilling when it reaches a high-yield gas layer. This would require the execution of a well killing operation to facilitate follow-up drilling and well completion. An empty well of gas-phase brings implementation of a gas-liquid two-phase transient flow, filling with killing mud. The operation may also entail coupling of the transient seepage from the formation with the gas-liquid two-phase transient flow through the wellbore. In this study, a mathematical model and a numerical method for coupling the transient gas flow through the formation with the gas-liquid two-phase transient flow in the wellbore were developed. The numerical simulation results showed that successful killing of an empty gas-drilled well required proper co-ordination of several key parameters among which the wellhead backpressure is particularly crucial to the operation. The findings of this study promise to facilitate the pro-cess design and parameter optimization for the killing of empty gas-drilled wells.

Instability Modes of Two-Phase Flows in a Mixing-Layer Microdevice

2001 ◽  
Author(s):  
Tak For Yu ◽  
Sylvanus Yuk Kwan Lee ◽  
Yitshak Zohar ◽  
Man Wong
Keyword(s):  
Gas Flow ◽  
Mixing Layer ◽  
Fluid Flows ◽  
Two Phase Flows ◽  
Two Phase ◽  
Pressure Distributions ◽  
Instability Modes ◽  
In Series ◽  
Mass Flow Rates ◽  
Flow Through

Abstract Extensive development of biomedical and chemical analytic microdevices involves microscale fluid flows. Merging of fluid streams is expected to be a key feature in such devices. An integrated microsystem consisting of merging microchannels and distributed pressure microsensors has been designed and characterized to study this phenomenon on a microscale. The two narrow, uniform and identical channels merged smoothly into a wide, straight and uniform channel downstream of a splitter plate. All of the devices were fabricated using standard micromachining techniques. Mass flow rates and pressure distributions were measured for single-phase gas flow in order to characterize the device. The experimental results indicated that the flow developed when both inlets were connected together to the gas source could be modeled as gas flow through a straight and uniform microchannel. The flow through a single branch while the other was blocked, however, could be modeled as gas flow through a pair of microchannels in series. Flow visualizations of two-phase flows have been conducted when driving liquid and gas through the inlet channels. Several instability modes of the gas/liquid interface have been observed as a function of the pressure difference between the two streams at the merging location.

Experimental, Numerical, and Statistical Investigation of Two Phase Flow in a Cylindrical Perforation Tunnel

2021 ◽  
Author(s):  
Ekhwaiter Abobaker ◽  
Abadelhalim Elsanoose ◽  
Mohammad Azizur Rahman ◽  
Faisal Khan ◽  
Amer Aborig ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Steady State ◽  
Statistical Analysis ◽  
Flow Rate ◽  
Gas Flow ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Gas Flow Rate ◽  
Two Phase ◽  
Flow Through

Abstract Perforation is the final stage in well completion that helps to connect reservoir formations to wellbores during hydrocarbon production. The drilling perforation technique maximizes the reservoir productivity index by minimizing damage. This can be best accomplished by attaining a better understanding of fluid flows that occur in the near-wellbore region during oil and gas operations. The present work aims to enhance oil recovery by modelling a two-phase flow through the near-wellbore region, thereby expanding industry knowledge about well performance. An experimental procedure was conducted to investigate the behavior of two-phase flow through a cylindrical perforation tunnel. Statistical analysis was coupled with numerical simulation to expand the investigation of fluid flow in the near-wellbore region that cannot be obtained experimentally. The statistical analysis investigated the effect of several parameters, including the liquid and gas flow rate, liquid viscosity, permeability, and porosity, on the injection build-up pressure and the time needed to reach a steady-state flow condition. Design-Expert® Design of Experiments (DoE) software was used to determine the numerical simulation runs using the ANOVA analysis with a Box-Behnken Design (BBD) model and ANSYS-FLUENT was used to analyses the numerical simulation of the porous media tunnel by applying the volume of fluid method (VOF). The experimental data were validated to the numerical results, and the comparison of results was in good agreement. The numerical and statistical analysis demonstrated each investigated parameter’s effect. The permeability, flow rate, and viscosity of the liquid significantly affect the injection pressure build-up profile, and porosity and gas flow rate substantially affect the time required to attain steady-state conditions. In addition, two correlations obtained from the statistical analysis can be used to predict the injection build-up pressure and the required time to reach steady state for different scenarios. This work will contribute to the clarification and understanding of the behavior of multiphase flow in the near-wellbore region.

Calibration of a Fast Neutron Scattering Technique for Measurement of Void Fraction in Rod Bundles

1979 ◽  
Vol 101 (2) ◽  
pp. 295-299 ◽  
Author(s):  
S. Banerjee ◽  
P. Yuen ◽  
M. A. Vandenbroek
Keyword(s):  
Neutron Flux ◽  
Fast Neutron ◽  
Void Fraction ◽  
Transient Flow ◽  
Phase Distribution ◽  
Flow Boiling ◽  
Rod Bundles ◽  
Two Phase ◽  
Scattering Technique ◽  
Flow Through

A technique based on scattering and transmission of fast neutron beams has been developed for measuring void fraction in two-phase flow through rod bundles. Experiments indicate that the scattered neutron flux varies linearly with void fraction and is largely independent of phase distribution. Measurements of the transmitted neutron flux have been used to determine phase distribution (or flow regime). The technique gives good sensitivity and count rates and appears suitable for void fraction and phase distribution measurements in transient flow boiling.

Measurements of Two-Phase Pressure Drop in a Simulated Debris Bed

2017 ◽  
Author(s):  
Milka Hebi Nava Rivera ◽  
Daisuke Ito ◽  
Yasushi Saito ◽  
Mitsuhiro Aoyagi ◽  
Kenji Kamiyama ◽  
...  
Keyword(s):  
Porous Media ◽  
Pressure Drop ◽  
Gas Flow ◽  
Two Phase Flow ◽  
Severe Accident ◽  
Phase Flow ◽  
Two Phase ◽  
Experimental Database ◽  
Flow Through ◽  
Measured Pressure

Two-phase flow through porous media should be well understood to develop a severe accident analysis code not only for light water reactor but also sodium cooled fast reactor (SFR). When a core disruptive accident occurs in SFR, the fuel inside the core may become melted and interacts with the coolant. As a result, gas-liquid two-phase flow will be formed in the debris bed, which may have porous nature depending on the cooling process. Thus, as first step, present work focuses on the characteristics of pressure drop in single- and two-phase flows in different porous media conditions (porous size, liquid and gas flow velocity). In addition, in order to construct an experimental database, the measured pressure drop under different conditions was compared with existing correlations.

Paper 22: Transient Flows in Short Curved Diffusers

1969 ◽  
Vol 184 (7) ◽  
pp. 45-56
Author(s):  
B. E. L. Deckker ◽  
T. K. Ramakrishnan ◽  
D. H. Male
Keyword(s):  
Pressure Wave ◽  
Transient Flow ◽  
Pressure Waves ◽  
Steady Regime ◽  
Circular Arc ◽  
Transient Flows ◽  
Area Distribution ◽  
Flow Through ◽  
Total Divergence ◽  
Curved Walls

The work reported is the first stage of an investigation into the effect of pressure waves of varying amplitude on the flow through the blade passages of turbomachines. Attention is confined to the interaction between the pressure wave and the geometry of four curved diffusers with the same area distribution about a circular- arc centre-line. The geometry of these diffusers is based on a straight diffuser with a total divergence angle equal to 12° and a length of 5 in. The nominal turning angles are 30°, 45°, 60°, and 90°. The transient flow through the five diffusers has been compared on the basis of sequences of Schlieren photographs taken at 50 μs intervals. The attenuation of the wave at the curved walls has also been measured. Systematic measurements have been made of the net and transmitted pressures, and also the pressures on the curved walls, during the quasi-steady régime. An attempt has been made to predict the net and transmitted pressures by means of two simple analyses, one of which is moderately successful. Diffuser effectiveness has been compared under conditions of steady and quasi-steady flow.

Modeling of Pig Assisted Production Methods

2002 ◽  
Vol 124 (1) ◽  
pp. 8-13 ◽  
Author(s):  
Hoi C. Yeung ◽  
Paulo C. R. Lima
Keyword(s):  
Gas Flow ◽  
Transient Flow ◽  
Fluid Model ◽  
Flow Behavior ◽  
Transient Behavior ◽  
Oil And Gas Industry ◽  
Experimental Program ◽  
Finite Difference Schemes ◽  
Two Phase ◽  
Process Gas

More and more transient gas-liquid operations in pipes have been successfully applied in the oil and gas industry. Pigging operation in two-phase pipelines to remove liquid accumulation or for cleaning purpose is an important transient operation. Another important operation is the injection of gas to transport the accumulated liquid in the pipeline to process facilities. Analysis of such transient two-phase flow in a pipeline is necessary not only for designing the liquid and gas handling facilities, but also for establishing safe operating procedures. In pipeline-riser systems, such operations cause even more severe change in flow conditions. A two-fluid model has been developed to determine the transient behavior of fluids during these operations. A one-dimensional set of equations for bubble/mist, annular and stratified flows has been derived. Slug flows were modeled as a combination of the foregoing. Semi-implicit finite difference schemes were used to solve the initial and boundary value problem for each phase of the pigging process: gas/pig injection, gas shut-in, slug production, and gas flow out of the system. An extensive experimental program was carried out to acquire two-phase transient flow and pigging data on a 69-m-long, 9.9-m-high, 50-mm-dia pipeline-riser system. A computer based data acquisition system was used to obtain rapidly changing and detailed information of the flow behavior during tests. The model compared well with the experimental data for characteristics such as inlet pressure, hold-up, and pig velocity. Liquid production efficiencies for different operations were compared.

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