IMPROVED INFLOW PERFORMANCE RELATIONSHIPS AND IMPROVED WELL BORE PERFORMANCE

2005 ◽  
Vol 45 (1) ◽  
pp. 27
Author(s):  
R.J. Watson
Keyword(s):  
Flow Regime ◽  
Gas Separation ◽  
Separation Efficiency ◽  
Well Bore ◽  
Pump Performance ◽  
Qualitative Estimate ◽  
Water Cut ◽  
Regime Map ◽  
Inflow Performance ◽  
Flow Regime Map

The inflow performance relationship for oil proposed by Vogel (1968) and extended by Brown (1981) has been modified empirically to allow for variations in water cut and gas liquid ratio.The well bore performance of wells flowing or gas lifting continuously is known to be affected adversely by the separation of fluids at the eductor (tubing or annulus) intake. Performance is affected mostly in wells with large well bore storage.The design of the tubing intake also affects separation. A tubing intake that will reduce separation in flowing wells and increase separation in pumped wells has been designed and tested in a transparent model.A qualitative estimate of the gas separation efficiency of this device has been made. The estimate is based on the Ros (1961) flow regime map and on observations by Beggs and Brill (1973) that liquid hold-up increases with well deviation up to 40º. Further tests are warranted.Rod pump performance is analysed in detail. A spreadsheet allows comparison of pump capacity with well inflowperformance.Even at very low gas/liquid ratios, gas separation at the tubing intake affects significantly both single and two stage pump performance.

CFD Investigation of Downhole Natural Gas Separation Efficiency in the Churn Flow Regime

2021 ◽  
Author(s):  
Charles Okafor ◽  
Patrick Verdin ◽  
Phill Hart
Keyword(s):  
Natural Gas ◽  
Flow Regime ◽  
Gas Separation ◽  
Separation Efficiency ◽  
Operating Conditions ◽  
Analytical Models ◽  
Design Stage ◽  
Average Error ◽  
Multiphase Model ◽  
Churn Flow

Abstract Downhole Natural Gas Separation Efficiency (NGSE) is flow regime dependent, and current analytical models in certain conditions lack accuracy. Downhole NGSE was investigated through 3D Computational Fluid Dynamics (CFD) transient simulations for pumping wells in the Churn flow regime. The Volume of Fluid (VOF) multiphase model was considered along with the k – ε turbulence model for most simulations. A mesh independence study was performed, and the final model results validated against experimental data, showing an average error of less than 6 %. Numerical simulation results showed that the steady state assumption used by current mathematical models for churn flow can be inaccurate. Several key parameters affecting the NGSE were identified, and suggestions for key improvements to the widely used mathematical formulations for viscous flow provided. Sensitivity studies were conducted on fluid/geometric parameters and operating conditions, to gain a better understanding of the influence of each parameter on NGSE. These are important results as they equip the ESP engineer with additional knowledge to maximise the NGSE from design stage to pumping operations.

Non-dimensionalization and three-dimensional flow regime map for fluidization analyses

2014 ◽  
Vol 119 ◽  
pp. 199-211 ◽  
Author(s):  
Kenya Kuwagi ◽  
Atsuto Kogane ◽  
Hiroyuki Hirano ◽  
Azri Bin Alias ◽  
Toshihiro Takami
Keyword(s):  
Flow Regime ◽  
Three Dimensional ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
Regime Map ◽  
Flow Regime Map

scholarly journals Flow Regime Map for Two Dimensional Spouted Bed and Comparison with Simulation by Discrete Element Method.

1999 ◽  
Vol 25 (6) ◽  
pp. 1037-1039 ◽  
Author(s):  
TOSHIRO TSUJI ◽  
TOMOKO CHIBA ◽  
TOSHIHARU SHIBATA ◽  
OSAMU UEMAKI ◽  
HIRONORI ITOH
Keyword(s):  
Discrete Element Method ◽  
Flow Regime ◽  
Discrete Element ◽  
Two Dimensional ◽  
Spouted Bed ◽  
Regime Map ◽  
Flow Regime Map ◽  
Element Method

scholarly journals Shear thickening regimes of dense non-Brownian suspensions

Soft Matter ◽  
2016 ◽  
Vol 12 (3) ◽  
pp. 914-924 ◽  
Author(s):  
Christopher Ness ◽  
Jin Sun
Keyword(s):  
Flow Regime ◽  
Shear Thickening ◽  
Suspended Particles ◽  
Soft Particle ◽  
Regime Map ◽  
Flow Regime Map

A flow regime map for suspended particles that unifies aspects of colloidal, granular and soft-particle rheology across remarkably diverse scales.

A New Heat Transfer Correlation and Flow Regime Map for Tube Bundles

1990 ◽  
Vol 112 (1) ◽  
pp. 150-156 ◽  
Author(s):  
Y. A. Hassan ◽  
T. K. Blanchat
Keyword(s):  
Heat Transfer ◽  
Flow Regime ◽  
Steam Generator ◽  
Tube Bundle ◽  
Nucleate Boiling ◽  
Heat Transfer Correlation ◽  
Transfer Coefficients ◽  
Tube Bundles ◽  
Regime Map ◽  
Flow Regime Map

A RELAP5/MOD2 computer code model for a once-through steam generator has been developed. The calculated heat transfer in the nucleate boiling flow was underpredicted as shown by a predicted superheat of only 11°C (20°F), whereas plant values range from 22–30°C (40–60°F). Existing heat transfer correlations used in thermal-hydraulic computer codes do not provide accurate predictions of the measurement-derived secondary convective heat transfer coefficients for steam generators because they were developed for flow inside tubes, not tube bundles. The RELAP5/MOD2 flow regime map was modified to account for flow across bundles. This modified flow regime map predicts better transition criteria between bubbly-to-slug and slug-to-annular flow. Consequently, improved saturated conditions for the fluid flow at the entrance to the boiler were obtained. A modified Chen-type heat transfer correlation was developed to predict the boiling heat transfer for steam generator tube bundle geometries. This correlation predicts better superheat.

Electrohydrodynamic atomization two-phase flow regime map for liquid hydrocarbon under pulsed electric fields with co-gas flow

2008 ◽  
Vol 66 (1-2) ◽  
pp. 94-98 ◽  
Author(s):  
J.S. Chang ◽  
C. Ayrault ◽  
D. Brocilo ◽  
D. Ewing ◽  
G.D. Harvel ◽  
...  
Keyword(s):  
Flow Regime ◽  
Electric Fields ◽  
Gas Flow ◽  
Pulsed Electric Fields ◽  
Liquid Hydrocarbon ◽  
Phase Flow ◽  
Two Phase ◽  
Regime Map ◽  
Flow Regime Map ◽  
Co Gas

Flow regime map and deposition rate uniformity in vertical rotating-disk OMVPE reactors

1992 ◽  
Vol 123 (3-4) ◽  
pp. 545-554 ◽  
Author(s):  
Catharina R. Biber ◽  
Christine A. Wang ◽  
Shahryar Motakef
Keyword(s):  
Flow Regime ◽  
Deposition Rate ◽  
Rotating Disk ◽  
Regime Map ◽  
Flow Regime Map
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