Post on 03-Jun-2018
transcript
8/12/2019 Application of Fluid Phenomena
1/15
Application of Fluid Phenomena and Study of theMethod of Transient Characteristics of Downhole (Oil
and Gas) Fluidic Pulsating Tool using FLUENT-ANSYS
by
Bharat Pawar, Harit Naik, Tim Hunter
at
2011 ANSYS Users Conference
Pune
8/12/2019 Application of Fluid Phenomena
2/15
2FOR INTERNAL USE ONLY
Loss of production or injectivity because of near
wellbore conductivity problems caused by
Scales
Paraffin
Migrating fines
Asphaltene deposits
Lost or dehydrated drilling mud
Well not producing at maximum potential
Ineffective stimulation treatments (acidizing,
fracturing, etc.) as a result of near wellbore
blockage or restrictions
Problem, Definition, and Objective
The objective of this paper is to review efforts to simulate the tool behavior using
FLUENT-ANSYS and study the application of fluid phenomena and transient
characteristics of fluid behavior surrounding the tool. Further, design parameters
are selected and fine-tuned based on simulation results to get the desired
frequency, mass flow rate (bbl/min), pressure drop, outlet vector plot, etc.
8/12/2019 Application of Fluid Phenomena
3/15
3FOR INTERNAL USE ONLY
Proprietary Pulsating Tool1
Inlet
Outlet 1
Outlet 2
Existing TechniquePulsating Tool
Proprietary pulsating tool is based on Coanda effect.
Several performance characteristics of this tool are further
enhanced with the help of FLUENT- ANSYS simulation.
Tool is run on coiled tubing
Unique design causes the tool to oscillate as fluid is pumped
through the tool.
Fluid can be acid, water, seawater, diesel, nitrified
fluids, etc.
8/12/2019 Application of Fluid Phenomena
4/15
4FOR INTERNAL USE ONLY
The principle of a fluid oscillator (FO) is the
Coanda effect. The Coanda effect is thetendency of a fluid jet to be attracted to a nearby
surface. This effect is explained with the help of
the figures below.2
Basic PrincipleCoanda Effect
8/12/2019 Application of Fluid Phenomena
5/15
5FOR INTERNAL USE ONLY
Transient FLUENT simulation of basic design
Parametric design optimization to identify critical geometrics
Conceptual design optimization to get further enhancement
Prototyping-I
Rapid prototyping and lab test
Design changes
Prototyping-II
Steel prototype and lab test
Correlation and designvalidation
Simulation Methodology
8/12/2019 Application of Fluid Phenomena
6/15
6FOR INTERNAL USE ONLY
Inlet throat
Feedback loops
Switching jet
Outlets
Pulsating Tool
The pulsating tool discussed here has
been specifically designed for high-pressure, submerged operation, along
with a specific oscillation frequency
target.
Cross-section of this pulsating tool pattern
8/12/2019 Application of Fluid Phenomena
7/15
7FOR INTERNAL USE ONLY
Input Parameters
Inlet pressure 500 to 2,000 psi
Mass flow rate 0.5 to 3 bbl/min
Outlet pressure Atmospheric
Flow media Water
Simulation type 2-D and 3-D (parallel
processing)Energy No energy equation activated
Turbulence model K-Omega SST
Solver Pressure-based, transient
Solution methods PISO-pv coupling and
standard pressure
discretization, second order
Convergence criteria 1e-5
Time step size 0.0002 sec
No. of time steps 2,000
Flow time 0.4 sec
Output Parameters
Mass flow rate
Pressure drop
Oscillation pattern
Oscillation frequency
Mass flow ratio
Vector plot
Simulation Parameters
Computational Domain of Pulsating Tool
8/12/2019 Application of Fluid Phenomena
8/15
8FOR INTERNAL USE ONLY
Parametric Optimization3
To visualize the oscillatory flow
through the tool, incremental snap-shots of relative fluid velocity were
saved during the transient response
simulation.
Parametersensitivity
A,BK are design
parameters
8/12/2019 Application of Fluid Phenomena
9/15
9FOR INTERNAL USE ONLY
FFT
Frequency, HzMass Flow At Outlets
Mass Flow Rate & Frequency From Outlet Port
8/12/2019 Application of Fluid Phenomena
10/15
10FOR INTERNAL USE ONLY
Time
Transient Modeling of Pulsating Tool
To visualize the oscillatory flow
through the tool, incremental snap-
shots of relative fluid velocity weresaved during the transient response
simulation.
8/12/2019 Application of Fluid Phenomena
11/15
11FOR INTERNAL USE ONLY
Prototyping and Test Setup
Example of EDM manufacturing process Experimental test setup
Manufacturing
Testing
8/12/2019 Application of Fluid Phenomena
12/15
12FOR INTERNAL USE ONLY
Benefits and Summary
For different inlet pressure, close correlation for mass flow rate and oscillation frequency
was observed between experimental measurement and FLUENT-ANSYS prediction.
FLUENT-ANSYS prediction of results helps accelerate product-development time.
New design of tool imparts lower oscillation frequency for deeper penetration into
formations.
Higher energy output over a narrower frequency range than a conventional tool.
No moving parts or seal; robust design.
This next-generation tool should effectively increase the efficiency of wells.4
8/12/2019 Application of Fluid Phenomena
13/15
13FOR INTERNAL USE ONLY
Challenges and Future Scope
Simulation was very sensitive to CFD mesh. Mesh-sensitivity study was carried
out to eliminate the mesh dependency.
New design involves thin, deep sections, which decrease the manufacturability
and life of the tool and insert.
Tool size limits the scope of intricate shapes. Efforts were made to keep it
simple and manufacturing-friendly.
Future scope is to test this tool in the field.
8/12/2019 Application of Fluid Phenomena
14/15
14FOR INTERNAL USE ONLY
Acknowledgement and References
The authors thank the management of Halliburton for their support and permission to
publish this paper. They would also like to express gratitude to all the team memberswho contributed to the job design, preparation, and execution of the operation to
achieve the results presented in this paper.
REFERENCES
1. Webb, E.D., Tucker, J.C., Meadows, M.L., and Pipkin, R.L. 2005. Apparatus and Method for Creating Pulsating Fluid Flow.
US Patent No. US6976507B1.
2. Webb, E.D., Schultz, R.L., Howard, R.G., and Tucker, J.C. 2006. Next Generation Fluidic Oscillator. Paper SPE 99855
presented at the SPE/ICoTA Coil Tubing Conference and Exhibition, The Woodlands, Texas, US, 45 April.
3. Roger, R.P. and Chan, S.C. 20033. Numerical Study of Fluidic Bistable Amplifiers. Paper AIAA 2003-3459 presented at 33rd
AIAA Fluid Dynamics Conference, Orlando Florida, USA, 2326 June.
4. Kritsanapkak, K. and Tirichine, S. 2010. Effectively Enhancing the NWB Stimulation Treatment using Fluidic Oscillation
Technique. Paper SPE 136065 presented at the SPE Production and Operations Conference and Exhibition, Tunis,
Tunisia, 810 June.
8/12/2019 Application of Fluid Phenomena
15/15
15FOR INTERNAL USE ONLY
Thank You.