omae real time monitoring to extend operating life of offshore platforms

www.pulse-monitoring.com

The Use of Real Time

Monitoring to Extend the

Operating Life of Offshore

Platforms

OMAE | June 2014


• Introduction

• Challenges

• Why Monitor?

• Monitoring Technologies

• Case Study: Valemon

– Project Overview

– Client Objectives

– Monitoring System

– Data and Results

• Conclusion

Agenda


Platform Age: A Visual Representation

Introduction

Estimates


ChallengesOffshore Platforms

Design | Environment | Fatigue | Corrosion | Impacts


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?


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)


Reliability Engineering Life Cycle

Why Monitor?

Useful Life

MonitoringInvestment

MonitoringROI

Service Life (Years)

Fati

gue

Rat

e

$ S

aved

Design Verification

Assumed Design Life


Monitoring TechnologiesEquipment Used

Accelerometers

InclinometersStrain Gauges Environmental

(Wave Radar & ADCP)


Monitoring TechnologiesSoftware and Data Management


Monitoring TechnologiesData 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


Valemon Jacket Monitoring

• Location: Norwegian North

Sea

• Water Depth: 135m

• Valemon jacket

– 9,000 tonne

– 20 slot capacity

• Monitoring Campaign:

2012/13

Introduction



• 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


Monitoring system




• 3 axis precision

accelerometers

• Installed in Eexd- rated

housings

• Hardwired back to central

control room using armoured

cable

Loggers


Valemon Jacket Monitoring Strain sticks

• Strain sticks installed in 4

locations

• Measuring curvature of the riser

• Each stick linked to an EExd

logger


Valemon Jacket Monitoring Environmental sensors

• Air-gap wave radar installed

• Measuring wave height and

period

• ADCP- measuring current

speed and direction through

depth


Valemon Jacket Monitoring Jackup Data – Displacement


Valemon Jacket Monitoring Jacket Data – Displacement


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

Dis

pla

ce

me

nt (

m)

Significant Wave Height, Hs (m)

Pulse E.On Huntington Data Processing Support

MAXIMUM MEASURED AND PREDICTED LATERAL MOTION ON JACK-UPMotion Logger POD-0007, 29/11/2012 - 24/01/2013

Maximum Measured Displacement Calculated (Nobel Denton)

Nobel Denton Hs vs. Displacement


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

Sig

nific

ant

Wave H

eig

ht,

Hs (

m)

Cu

mu

lativ

e D

am

ag

e

Event Timeline

Statoil - West Elara And Valemon Platform Monitoring Campaign

CUMULATIVE FATIGUE DAMAGE - UPPER HP RISERMeasured Data - 13/02/2013 - 25/02/2013

Measured Data Predicted Data Significant Wave Height Hs



• 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


• 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


More Info

• Visit www.pulse-monitoring.com

• Or email: [email protected]

http://www.pulse-monitoring.com/

mailto:[email protected]


References

• Use of Real Time Integrity Monitoring on Valemon Jacket During

Drilling Operations, A. Rimmer - 2H, I. Træen, H. Moberg - Statoil

omae real time monitoring to extend operating life of offshore platforms

Engineering

jacket deflections

measured data

use of real time monitoring

real time integrity

monitor deflections

data management

motion data acceleration

future operations data