Subsea Choke Enhancements that Lead to Asset Life … subsea uk... · Subsea Choke Enhancements...
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Subsea Choke Enhancements that Lead to Asset Life Extensions Presented by: - David Johnson Product Manager - Surface Chokes and Subsea Products
Transcript of Subsea Choke Enhancements that Lead to Asset Life … subsea uk... · Subsea Choke Enhancements...
Subsea Choke Enhancements that Lead to Asset Life Extensions
Presented by: -
David Johnson
Product Manager - Surface Chokes and Subsea Products
DISCUSSION POINTS:
Velocity Control
Nexen
Statoil
o Kent Introl Products
o Well Profile Changes
o Velocity Control
o Trim Technology
o Case Study 1
o Case Study 2
o Conclusions
AGENDA
kentintrolKENT INTROL PRODUCTS
kentintrolWELL PROFILE CHANGES
• Chokes are generally designed to suit the original flow parameters. However for various reasons these parameters may change during the life of the field
• Introduction of water injection
• Increased sand production
• Change from Production wells to Injection wells
• Subsea tie backs to manifold chokes
kentintrolWELL PROFILE CHANGES?
• These changes in the flow parameters can lead to severe damage to the existing chokes
• Seat leakage
• Cavitation
• Sand erosion
• Trim blockage
• Trim collapse
• Problems
• Vibration
• Noise
• Poor control
• Lost production
• High maintenance
• Damage to downstream equipment
kentintrolCAVITATION – SINGLE STAGE TRIM
kentintrolVELOCITY CONTROL ELIMINATES PROBLEMS :
kentintrolFLUID ENERGY / VELOCITY CONTROL
Single-stage pressure drop Multi-stage velocity control
kentintrolVELOCITY COMPARISONSo Water fountain
o 1.5 m/s (5 ft/s)o Spray nozzle
o 12 m/s (40 ft/s)o Fire hose
o 20 m/s (65 ft/s)
o Through valve trimo 30.5 m/s (100 ft/s)
kentintrolTRIM TECHNOLOGY:
o HF (High Friction) Single Stage & Multi-Stageo For Production
Applicationso Microspline & Multi-spline
o For MEG and Methanol Injection
o LCV (Level Control Valve)o For Sandy Applications
o Vari-Stage Trimso Torturous Path Trims
Different trim designs with special features to suit all applications
kentintrolHIGH PRESSURE DROPS
High Pressure Drop
High Fluid Velocity / Energy
Enemy
Competitors Eroded Guides
kentintrolNEXEN: Case Study 1
Before
Before
kentintrolNEXEN: Case Study 1o Design enhancements: -
o Conducted new sizing calculations
o Balanced the plug differentlyo High Range-ability trim
kentintrolNEXEN: Case Study 1
o Design enhancements: -o Multi-Stage trim Design
kentintrolNEXEN: Case Study 1
After After
kentintrolSTATOIL / TechnipFMC: Case Study 2
o We have been able to work with our clients to agree standard specification for products and this has seen significant cost savings of 30%.
o Also with an agreed stocking policy we have been able to reduce the deliveries down to 8 weeks.
kentintrolSTATOIL / TechnipFMC: Case Study 2
o 30% Cost reduction & Improved performance
kentintrolCONCLUSIONS
o When well conditions change, the choke may no longer be suitable
o Sizing against the actual flowing parameters will allow for the correct selection of the choke internals
o Existing subsea chokes can be enhanced to accommodate the new process parameters
o Correctly selected velocity control trim technology and the use of superior trim materials does improve the life expectancy of the choke and downstream equipment
o This all leads to the life extension of the asset
WE WELCOME YOUR QUESTIONST: +44 (0)1484 710311E: [email protected]: www.kentintrol.com
A: Koso Kent Introl LimitedArmytage RoadBrighouseWest YorkshireHD6 1QF
