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Fibre Optic enabled Slickline delivering DAS and DTS
John Creighton
Outline Introduction
Intervention Hardware
Data Acquisition Hardware – DAS/DTS
Case Study Outline
Job Statistics
DTS & DAS Raw Data
Processing of Data
Interpretation of Data
Conclusions
Questions
IntroductionWhat is Distributed Sensing?• Continuous, real-time measurements along the length of a fibre optic cable
Why choose Distributed Sensing?• Passive in-well sensing improves Reliability
• Complete view of the entire well
• Cost & Time Efficiencies
How can we gather Distributed data?• Permanent
• Coil / Rod
• E-line
• Slickline
Intervention Hardware
Retrofit
Patented Technology
• 0.125” OD Standard Slickline size
• CO2 & H2S resistant
• Tensile Strength @ 1400 lbs
• Max Reel Length 20,000 ft / 6000 m
• 300 DegF / 150 DegC
• Contains Single Mode Fibre - 9µm
• Contains Multimode Fibre - 50µm
Intervention Hardware
• 1.69 m x 1.96 m x 2.77 m• 5700 Kg
• Logistically simple
• Flexible Deployment
• Small Footprint
System Set-Up
Acquisition Boxes
• Acoustic Optical Acquisition Panel
• 100ns Pulse Width
• 10 kHz Pulse Repetition Frequency
• Spatial Resolution 10 m
• Temperature Optical Acquisition Panel
• Thermal resolution 0.06 DegC
• Spatial Resolution 1.02 m
• 5 Minute Stacking
Case Study
Sustained pressure build up in A-annulus at < 10 psi/day.
• Determine the potential source of the pressure to help plan the plug
and abandonment of the well
• Monitor potential fluid movement in a well to try and determine the
source of an A-Annulus PBU.
• Perform a Distributed Acoustic & Temperature survey using fibre
enabled slickline
Job Execution • Rig up to Rig Down Time ~13hrs
• Survey Time ~5hrs
• 1.9 TB Raw DAS Acquired & 14.3 MB DTS Acquired
• DAS data decimated to 1GB & Integrated with DTS/Memory Gauge for holistic
analysis
• P, T, GR & CCL Data provided downhole DTS calibration & depth control
• Data processed and interpreted within 3 days
Raw DTS
Raw DAS
Interpretation
Interpretation
Conclusions
• Data indicated downward fluid movement at 9 5/8 Window
• No movement detected below the 9 5/8 Window
• Low velocity consistent with slow rate
• DAS/DTS data confirmed pressure build-up was not from Reservoir
• Data aligned with pressure build up and annulus sample analysis
• Client could complete reservoir abandonment via intervention
Questions