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Data quality assurance methods for improved distributed temperature
sensing (DTS) data Management
Iko Oguche
SPE INWELL MONITORING & SURVEILLANCE SEMINAR 2019Transforming data to barrels2 October 2019, Aker Solutions, Dyce
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– DTS principles and Background
– Importance of good quality data
– Factors that can affect data quality
– Correction methods & lessons that could be learnt
– Data management system solution
Presentation Outline
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The Fibre is the Sensor
- Distributed measurement- Core components
- Surface acquisition unit- Optical fiber
- Depth resolution- From about 0.35m
- Temperature resolution- Cab better than 0.01°C (no post
processing)- Temperature Range
- Up to 700 °C - Range
- Up to 100km- No electronics or moving parts in
monitoring zones - Deployment
- Permanent (Attached to production tubing)
- Intervention
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Temperature From Light
4
– Pulsed Laser travels through fiber
– Back-scattered light returns to fiber optic box
– Back-scattered light is processed to get useful information (Temperature, Strain, Sound)
– Raman (DTS) – Temperature Measurement (0.01˚C)
– Brillouin (DTSS) – Strain and Temperature (0.5 ˚C)
– Rayleigh (DAS) – Acoustic measurement
Depth Speed of light X Time2
=
Zrelli Amira, Mohamed Bouyahi, Tahar Ezzedine ‘Measurement of Temperature Through Raman Scattering’ AWICT 2015
FIBER OPTIC BOX
Laser
Measuring Unit
Pass Through
Reflected
Scattered
Absorbed
Refracted
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DTS vs PLT
PLT
DTS
PLT data offset to allow for side by side comparison
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Data Quality Matter!
10s readings1 trace
1 hour reading1 trace
Approx. 1°C offset
Geothermal Temperature
Temperature Offset Data Noise
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Different ways Things can go Wrong
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Case 1: Pairing DTS with Other Downhole Data
PDG
PDG
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Case 2: Smarter Completion
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Case 2: Smarter Completion
Shut-in Traces Shut-in + Production Traces Corrected Traces
Temperature at the sump is fixed to a known value
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Case 2: Smarter Completion
15 – 16 August 2016 SPE Reserves, Resources and Definition Workshop 12
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Case 3: Fiber failure
15 – 16 August 2016 SPE Reserves, Resources and Definition Workshop
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Case 3: Fiber Failure Modes
14
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Big data
DTSWITSML
~ 160 kB
Every 4 hrs
720 / mth
8640 / yr
DTSWITSML
~ 160 kB
Every 1 min
43,200 / mth
518,400 / yr
• Data centres are here to stay
• Large amount of data can be generated
• Data quality monitoring is necessary
• Going through these data can be time consuming
• Shortage of skilled workers
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Data Management System
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Automation Example
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Conclusion
– Data issues will come up at some point
– Understand your well
– Data health check
– Have a global approach
– Automation is the way forward
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Thank you…Questions?
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