Mike Webster Intelligent Wells Project UTG Aberdeen

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Mike Webster Intelligent Wells Project UTG
Aberdeen FORCE Seminar Stavanger Norway
28th-29th March, 2001
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Fiber Optic Sensors Development and Challenges
Mike Webster Intelligent Wells Project UTG
Aberdeen FORCE Seminar Stavanger Norway
28th-29th March, 2001
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Why should we be interested in optical sensors ?
Intelligent Wells Project mission Develop
technologies for deepwater developments that
provide reliable reservoir surveillance
information and allow control of zonal
contribution without intervening into the
wells. Goal Achieve a 90 system survivability
over 5 years. Current electrical
system performance falls short of assets goals.
Current Electronic Flowmeter and Gauge Track
Record
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Drivers for Fiber Optic systems

• Potential for Increased reliability of the
  downhole sensors
• Subsurface is passive
• Surface optoelectronics can be maintained and
  upgraded
• Ability to install a large number of varied
  sensor types
• Ability to survive in harsh environments
  (particularly temperature)
• Distributed sensing removes the need to select
  point of measurement
• Choice of fixed installation or renewable
  hydraulic deployments
• Leverage off large telecoms RD spend

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Fiber Optic Sensing Implementations
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Point Sensor Fiber Optic Monitoring Systems
Flow/Phase Fraction
Pressure/Temperature
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Optical Pressure Gauge Gaps and Trials

• Technology Development and Field Trials
• Optoplan gauges deployed in Gyda (Aug 94)
• First Cidra Bragg grating installed in Pompano
  April 2000
• Large number of installations planned in 2001
  including Valhall

• Technology Gaps
• Optical wet connector enhancements
• Subsea integration and deployment of optical
  systems

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Distributed Temperature Current Claims
/-0.5 deg C resolution at 2m up to 30 km
/-0.1 deg C resolution at 1m up to 12 km
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Current/Future DTS Installations
Current DTS Installations Wytch Farm K-07 April
97 ESP Pump monitoring Wytch Farm M-12 May
98 Commingled Producer/Injector Wytch Farm M-17
Sept 99 Producer Marlin A-06 Dec 00 VIT
surveillance Marlin A-04 Feb 01 VIT
surveillance Future Installations Trinidad Maho
gany May 01 4 wells gas inflow
monitroring Chirag Sept 01 Sand face
monitoring Wytch Farm Aug 01 ESP Producers
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How can we validate DTS data ?
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Thermal Modelling of PLT Data
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Field example Wytch Farm M-17 watercut increase
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Field example Wytch Farm M-17 thermal profile
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Where do we want to go with DTS ?

• Increased deployment of DTS in a variety of
  environments
• Single ended vs Double
• Pump down vs hard wire
• Bench test all current DTS optoelectronics
  systems
• Deploy DTS fiber with optical point measurement
  devices
• Encourage the inclusion of DTS fiber in downhole
  electrical cable
• Enhance current DTS performance to achieve the
  following spec
• Thermal Resolution lt0.1 deg C
• Spatial resolution lt3m
• Distance from light source 20km
• Sample time lt24hrs

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BP Intelligent Wells Optical Objectives 2001
Comprehensive Reliability assessment of fiber
optic systems Increased utilization of optical
pressure gauges company wide Development of
downhole and tubing hanger optical wet connects
Extended range DTS system Seabed optical
architecture and integration Integration of
fiber into well components associated with deep
water completions Integration of fiber onto sand
screens / expandable screens
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The Vision
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Continuous Surveillance
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Mike Webster Intelligent Wells Project UTG
Aberdeen FORCE Seminar Stavanger Norway
28th-29th March, 2001