The effect of gas injection geometry and an insight into the entrainment and coalescence processes concerned with a stationary Taylor Bubble in a downward two-phase flow

2021 ◽  
pp. 110491
Author(s):  
M. Abdulkadir ◽  
A. Abdulahi ◽  
L.A. Abdulkareem ◽  
O.E. Alor ◽  
B. Ngozichukwu ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Gas Injection ◽  
Phase Flow ◽  
Two Phase ◽  
Taylor Bubble ◽  
Insight Into

GAS LIFT IN BASS STRAIT

1985 ◽  
Vol 25 (1) ◽  
pp. 107
Author(s):  
Kathryn J. Fagg
Keyword(s):  
Oil Recovery ◽  
Joint Venture ◽  
Two Phase Flow ◽  
Gas Injection ◽  
Phase Flow ◽  
Gas Distribution ◽  
Two Phase ◽  
Future Developments ◽  
Artificial Lift ◽  
Gas Lift

Gas lift has proved a most effective artificial lift method for the fields operated by Esso Australia Ltd in Bass Strait for the Esso-BHP joint venture. Gas lift is now used to produce approximately 5 st ML/d of the total crude production from the Strait. It has enabled wells to be produced to water cuts higher than 90 per cent, increasing the oil recovery from the fields by up to 35 per cent.Gas lift work in Bass Strait to date has included the use of special packoff gas lift assemblies for wells with sliding sleeves, the development of a tool to assist the opening of the sleeves, improved operating techniques to limit slugging from gas-lifted wells, and the testing of gas lift performance. Gas lifting has been more successful than expected, and as a result, workovers initially planned to install full gas lift strings for older wells have not been necessary. The two phase flow correlations available have been improved to match the performance of the gas-lifted wells. The correlations are now used to design tubing strings with a number of gas lift mandrels prior to running the initial completions and to select the optimum gas injection depth.Future work in gas lift for Bass Strait will involve the optimisation and automation of lift gas distribution on the platforms. Gas lift will also be used for planned future developments, including mini-platforms and subsea completions.

Numerical Analysis of Two-Phase Flow in Gas-Stirred Reactors

1990 ◽  
Vol 204 (5) ◽  
pp. 311-319
Author(s):  
Y M Ferng ◽  
C C Chieng ◽  
C Pan
Keyword(s):  
Experimental Data ◽  
Liquid Metal ◽  
Two Phase Flow ◽  
Gas Injection ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Water Model ◽  
Phase Flow ◽  
Two Phase ◽  
Stirred Reactors

Using the multi-dimensional, turbulent, two-phase flow model, the fluid flow phenomena for gas injecting through a submerged lance in gas-stirred reactors are investigated numerically by a finite difference algorithm. The present numerical model is validated by comparison with the experimental data of the water model and extended to predict the flow fields and mixing phenomena inside the liquid metal model. This study indicates that the flow characteristics and mixing behaviour of the water model are similar to the metal model and the experimental data of the water model can be an important reference for the design of liquid metal reactors. The investigations consist of central (two-dimensional) and off-centred gas injection (three-dimensional) with full—and fractional—depth of lance submergence and with different gas injection rates.

Simultaneous gas and water flow in a damage-susceptible bedded argillaceous rock

2015 ◽  
Vol 52 (1) ◽  
pp. 18-32 ◽  
Author(s):  
T.S. Nguyen ◽  
A.D. Le
Keyword(s):  
Water Flow ◽  
Gas Flow ◽  
Two Phase Flow ◽  
Gas Injection ◽  
Injection Pressure ◽  
Opalinus Clay ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Rates ◽  
Inherent Anisotropy

A mathematical model that couples the governing and constitutive equations of two-phase flow and mechanical equilibrium has been developed to simulate gas injection tests for both laboratory- and field-scale experiments. The model takes into consideration the inherent anisotropy of sedimentary rocks due to bedding by including an anisotropic elastoplastic model for the mechanical process and using an anisotropic permeability tensor for the flow processes for both water and gas. The gas and water flow rates are assumed to follow Darcy’s law. The relative permeability of each phase and their respective degrees of saturation are represented by the Van Genuchten’s functions. We simulated laboratory and field gas injection experiments in Opalinus clay, a candidate geological formation for the geological disposal of radioactive wastes. The numerical results show good agreement with the experimental data measured in these tests in terms of two-phase flow regimes and hydromechanical response at various monitoring locations. Damage zones, either pre-existing due to excavation or induced by high gas injection pressure, are shown to clearly influence the gas flow rates and directions and would need special consideration in the design and safety assessment of the repository system.

Effect of Riser Base and Flowline Gas Injection on the Characteristics of Gas-Liquid Two-Phase Flow in a Vertical Riser System

2020 ◽  
Author(s):  
Salem Kalifa Brini Ahmed ◽  
Aliyu M. Aliyu ◽  
Adegboyega Ehinmowo ◽  
Hoi Yeung
Keyword(s):  
Two Phase Flow ◽  
Gas Injection ◽  
Phase Flow ◽  
Two Phase

CFD Validation of Gas Injection Into Stagnant Water

2007 ◽  
Author(s):  
Ashraf Ibrahim ◽  
David Felde ◽  
Bernard Riemer ◽  
Mark Wendel
Keyword(s):  
Acoustic Waves ◽  
High Speed ◽  
Two Phase Flow ◽  
Gas Injection ◽  
Phase Flow ◽  
Cfd Model ◽  
Stagnant Water ◽  
Two Phase ◽  
Oak Ridge ◽  
Liquid Mercury

Investigations in the area of two-phase flow at the Oak Ridge National Laboratory’s (ORNL) Spallation Neutron Source (SNS) facility are progressing. It is expected that the target vessel lifetime could be extended by introducing gas into the liquid mercury target. As part of an effort to validate the two-phase computational fluid dynamics (CFD) model, simulations and experiments of gas injection in stagnant water have been completed. The volume of fluid (VOF) method as implemented in ANSYS-CFX was used to simulate the unsteady two-phase flow of gas injection into stagnant water. Flow visualization data were obtained with a high-speed camera for the comparison of predicted and measured bubble sizes and shapes at various stages of the bubble growth, detachment, and gravitational rise. The CFD model is validated with these experimental measurements at different gas flow rates. The acoustic waves emitted at the time of detachment and during subsequent oscillations of the bubble were recorded with a microphone. The acoustic signature aspect of this validation is particularly interesting since it has applicability to the injection of gas into liquid mercury, which is opaque.

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