Fibre Optic enabled Slickline delivering DAS and DTS · Fibre Optic enabled Slickline delivering...

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