Presented at OMAE San Francisco in 2014 by Paul Chittenden, this presentation shows how oil and gas operators are using real-time monitoring to extend the life of their production platforms. Operators are using Pulse's monitoring technologies for some of the following: • Extending operating life • Structural Integrity (Storm Events) • Optimising inspection programs • Early warning systems (Structural or Foundational) • Assessing Repairs • Increasing deck mass • Adding conductors / risers • Collision detection • Design verification (New Installations)

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The Use of Real Time
Monitoring to Extend the
Operating Life of Offshore
Platforms
OMAE | June 2014

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• Introduction
• Challenges
• Why Monitor?
• Monitoring Technologies
• Case Study: Valemon
– Project Overview
– Client Objectives
– Monitoring System
– Data and Results
• Conclusion
Agenda

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Platform Age: A Visual Representation
Introduction
Estimates

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Challenges
Offshore Platforms
Design | Environment | Fatigue | Corrosion | Impacts

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Operating Past Design Life
• Asset life extension being
driven by:
– Technological Advancements
– High price of oil
– Increasing use of subsea
tiebacks
– Operator focus on cutting costs
Why?

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Why are Clients Monitoring?
• Extending operating life
• Structural Integrity (Storm Events)
• Optimising inspection programs
• Early warning systems (Structural or Foundational)
• Assessing Repairs
• Increasing deck mass
• Adding conductors / risers
• Collision detection
• Design verification (New Installations)

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Reliability Engineering Life Cycle
Why Monitor?
Useful Life
Monitoring
Investment
Monitoring
ROI
Service Life (Years)
FatigueRate
$Saved
Design
Verification
Assumed
Design Life

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Monitoring Technologies
Equipment Used
Accelerometers
Inclinometers
Strain Gauges Environmental
(Wave Radar & ADCP)

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Monitoring Technologies
Software and Data Management

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Monitoring Technologies
Data Processing and Reporting
• Spectrum of the motion data (Acceleration versus Freq)
• Natural frequency determination
• Integration of time series (Displacement)
• Wave information (Wave height, Period or directions)
• Screens of anomalies
• Repair / modification verification
– Decrease of displacement

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Valemon Jacket Monitoring
• Location: Norwegian North
Sea
• Water Depth: 135m
• Valemon jacket
– 9,000 tonne
– 20 slot capacity
• Monitoring Campaign:
2012/13
Introduction

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Valemon Jacket Monitoring
• Monitor pre-drilling phase:
– Monitor deflections of jacket and
jackup
• Confirm that equipment is operated
within design limits:
– Confirm that jacket deflections
remained within expected levels
• Validate & calibrate simulation models:
– Compare measured and predicted
responses to improve models for future
operations
Client requirements
Increased motion
after jacking up

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Monitoring system
Valemon Jacket Monitoring

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Valemon Jacket Monitoring
• 3 axis precision
accelerometers
• Installed in Eexd- rated
housings
• Hardwired back to central
control room using armoured
cable
Loggers

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Valemon Jacket Monitoring
Strain sticks
• Strain sticks installed in 4
locations
• Measuring curvature of the riser
• Each stick linked to an EExd
logger

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Valemon Jacket Monitoring
Environmental sensors
• Air-gap wave radar installed
• Measuring wave height and
period
• ADCP- measuring current
speed and direction through
depth

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Valemon Jacket Monitoring
Jackup Data – Displacement

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Valemon Jacket Monitoring
Jacket Data – Displacement

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Valemon Jacket Monitoring
Data – Valemon Jacket Motion / Wave Height
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0 1 2 3 4 5 6 7 8 9 10
Displacement(m)
Significant Wave Height, Hs (m)
Pulse E.On Huntington Data Processing Support
MAXIMUM MEASURED AND PREDICTED LATERAL MOTION ON JACK-UP
Motion Logger POD-0007, 29/11/2012 - 24/01/2013
Maximum Measured Displacement Calculated (Nobel Denton)
Nobel Denton Hs vs. Displacement

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Valemon Jacket Monitoring
Data - Jacket Motion Fatigue
0
2
4
6
8
10
12
14
1.0E-10
1.0E-08
1.0E-06
1.0E-04
1.0E-02
1.0E+00
13-Feb 17:02 16-Feb 17:02 19-Feb 17:02 22-Feb 17:02
SignificantWaveHeight,Hs(m)
CumulativeDamage
Event Timeline
Statoil - West Elara And Valemon Platform Monitoring Campaign
CUMULATIVE FATIGUE DAMAGE - UPPER HP RISER
Measured Data - 13/02/2013 - 25/02/2013
Measured Data Predicted Data Significant Wave Height Hs

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Valemon Jacket Monitoring
• Monitoring system’s demonstrated responses of critical equipment
remained within design limits during campaign length
• The jacket moves 25-33% as much as jackup
• Complex responses of the jackup to wave loading observed
• Preliminary model calibration achieved, but difficult to fully
calibrate at this stage
Outcome

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• Platform monitoring is integral
to the IM Strategy of offshore
platforms
• Online Monitoring is used to
measure actual response vs
predicted responses to
validate design and improve
models for future operations
• Data used to make informed
decisions on life extension of
assets
Conclusion
Conclusion

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More Info
• Visit www.pulse-monitoring.com
• Or email: info@pulse-monitoring.com

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References
• Use of Real Time Integrity Monitoring on Valemon Jacket During
Drilling Operations, A. Rimmer - 2H, I. Træen, H. Moberg - Statoil