AOG 2015 - Pulse - Acoustic system to monitor wellhead ...
Transcript of AOG 2015 - Pulse - Acoustic system to monitor wellhead ...
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AOG 2015Acoustic System to Monitor Wellhead Fatigue in Real-time
March 12th 2015
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• Monitoring method currently used
• Online monitoring
• New generation wireless monitoring
• Benefits of active monitoring
• Other applications
Agenda
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Improve operational efficiency
Asset life extension
Design verification
Understanding for future
improvements
Enhance operational
safety
Proactive integrity
management
To quantify the unknown
Asset life extension
Greater understanding of asset fatigue history
• Greater understanding of asset fatigue history
• Reduced stress on critical riser components
Improve operational efficiency
• Optimizing inspection andmaintenance strategies
• Improved decision making and longer operating windows
Understanding for future
improvements
• Provides historical record of structural performance
• Identify anomalies/ errors in design, installation, operation etc
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Design verification
Greater understanding of asset fatigue history
• Validate riser performance against design
• Reduce conservatism in analysis through the use of real world data
Enhance operational
safety
Greater understanding of asset fatigue history
• Understanding how much fatigue is being accrued over the length of the operation
• Reduction in unplanned incidents
Proactive integrity
managementGreater understanding of
asset fatigue history
• Adhere to industry regulations and standards
• Protect individual and corporate reputation
Why Monitor ?
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Divider SlideMonitoring Method Currently Used
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Standalone Method
• 1 Vessel logger for vessel motion
• 5-10 Riser data loggers to identify VIV
mode
• 1-2 BOP / LMRP / guide base data
loggers for BOP displacement – wellhead
/ conductor fatigue
Standalone - ROV Retrievable
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Standalone Method
• Method is highly reliable but has some limitations:
– No data available for real time decision making
– Powered by batteries which restrict logging campaign length and frequency of data collection
– Data availability dependent on ROV’s ability to dive
Overview and Limitations
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Divider SlideOnline Monitoring
ROV connector plate
Hardwired motion logger
•Hardwired motion logger attached to rigid section of BOP or LMRP whilst topside•Logger wired to ROV connector plate using subsea cable
Guide wire 1
Subsea cable
•BOP installed using 4 guidewires•After installation one guidewire (guidewire 1) remains in place
•Subsea cable strapped to guide wire 2 lowered along guide wire 1•The guidewire is hooked onto the pre‐installed steel rope loop •ROV plugs the connector into the ROV connector plate•The monitoring system is now fully operational with BOP motions visible in real time from the rig
Guide wire 2 hooked to LMRP
Subsea cable plugged into ROV connector plate
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Divider SlideNew Generation Wireless Monitoring
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Wireless Monitoring
• Wireless transfer of data
• Data available on demand
• Installation can be done via ROV - does not interfere with rig
operations
• Only useful information is transmitted
• Greater than 6 months battery life
Overview
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Wireless MonitoringAcoustic System Overview
• 1 Deployment Frame
• 1 Acoustic Receiver
• 1-2 Subsea Data Logger
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Wireless Monitoring
Acoustic Receiver
• Dunked over the side
• Through the moonpool
• I-tube deployment
• Using existing hipap
• Using existing LBL array
Dunking Modem10m below MSL
Winch + subsea cable
Topside cable to Laptop
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New Generation Wireless Monitoring
Motion Logger
INTEGRIpod strapped to BOP
Acoustic Transmitter
• Motion Logger
• Acoustic transmitter
• Both strapped to BOP
• Outrigger may be required
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Wireless Monitoring
Acoustic Technology
• Can travel 3000m+ through water
• Can work in noisy DP environment
• Doesn’t affect other signals
• Requires line of sight
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Wireless Monitoring
Why is this technology available now ?
• Advances in Technologies – Low power computation
– Faster data processor/microcontroller
– Larger memory capacity
– Reliable technology
• Advances in acoustic technology– Confidence in the systems
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Benefits of Active Monitoring
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Benefits of Active Monitoring
• Aid Drilling Operations through active near real time monitoring data:
– Differential lower flex joint angles
– BOP movement and vibration
– Riser modes and shape
– Bending loads on conductor
– Tension at riser adaptor
Ability to Make Real-time Decisions
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Benefits of Active Monitoring
All parameters within normal
operating limits
1 parameter outside normal operating limits
> 1 parameter outside ultimate operating limits
Optimise JudgementAction Required
RecommendedDisconnect
GREEN AMBER REDSTATUS
SITUATION
ACTION
• Traffic Light Alarm Functionality
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Benefits of Active Monitoring
Data in Real-time
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Benefits of Active Monitoring
Overview
• Data available for real time decision making
• Near elimination of data screening and processing activities
• Reduced intervention cost through improved logging duration
– Offshore personnel or ROV intervention
• Real-time feedback of riser analysis model
• Part of IM strategy - Advanced warning to prevent from a catastrophic
failure
• Increases efficiency and can save costs
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Benefits of Active Monitoring
• Up to 9 days from disconnect to return to drilling operations• Rig daily cost $250k to $1M• Possible savings: $2,25M to $9M
Rig Time Saving
0
20
40
60
80
100
No Monitoring Monitoring
Time to Drill a Well
Drilling Run Casing Maintenance Run Riser Test BOP
97 Days 88 Days
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Benefits of Active Monitoring
Rig Time Saving
• Monitoring daily cost $500 to $2,000 (depending on configuration)• Less than 0.1% of operating costs
Cost of Monitoring
Rig Costs
Cost Comparison
Cost of Monitoring Rig Costs
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Benefits of Active Monitoring
Comparison of methodologies
Pros ConsStandalone Lowest cost
Simple to install No real time data High requirements on ROV
Wireless Near real-time communications for operational decision making
Improved Real-time fatigue calculation Battery/memory typically longer
than drilling campaign – so no ROV requirement
Still requirement for dunking modem
Online Wired Fully real time data No bandwidth restriction No issues with power/memory
management
Higher costs (especially in deeper water)
Cable management Difficult to repair/service once
deployed
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Divider SlideOther Applications
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Other Applications
• Flexible riser global response• Pipelines VIV and slugging • Export Line from a fixed platform• Mooring Lines
The wireless data logger can also be used in monitoring
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• Less Intervention = lower operations cost and risk
• Lower risk through improved safety features
• Provide near real time integrity data• Vital for making operating decisions
in real time
Summary
Acoustic Monitoring