Market Potential
Why Target Long-distance Liquid Tiebacks?
- Huge volumes of discovered hydrocarbons worldwide are currently “stranded”*
- 119 fields found between 2008 and 2016 with collectively 11Bbbl of oil and 36 Bboeof gas
- Many of these “stranded” fields are small deepwater liquid discoveries ranging in distance from 30 to 100 km from a host platform
- These fields cannot be exploited with current conventional subsea tieback technology
- A new approach is required to unlock these fields
* According to a study by Westwood Global Energy Group
Targeting “Stranded” Reservoirs
What is the limiting deepwater conventional liquid tieback distance?
Drive Pressure
- Natural drive limit of ~20 km
- Feasible, but reduced recovery at ~30km
Intervention Times During Unintended Shutdowns
- Sufficient intervention time: No-Touch Time + Treat Wells/Manifold + Dead-Oil Circulate (DOC) < Wax/Hydrate Formation Time
- 20 km looped Wet-Insulated lines have insufficient intervention time
- 30 km looped Pipe-in-Pipe lines have sufficient intervention time
- 50 km looped Pipe-in-Pipe lines have insufficient intervention time
ASTEP I.S.
Autonomous Subsea Tieback Enabling Platform Integrated System
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