1. Shell UK Exploration and Production
Monday 12 November 2001
Sub-Sea Gas-Lift Session
1. Chevron’s design philosophy (Ken Decker)
2. Equipment for GL in deepwater (Roger Stinson)
3. Reducing well-test deferments (Philip Holweg)
4. GL as back-up of ESP lifted wells (Eric Lovie/ Philip
Holweg)
Sub-Sea GL Panel Session (Wim der Kinderen)
Shell UK Exploration and Production

2. Shell UK Exploration and Production
How can we eliminate or alleviate limitations
of sub-sea gas-lift ?
Shell UK Exploration and Production

3. Shell UK Exploration and Production
Subsea Gas-Lift Issues
Expensive well entries
Compromised lift depth
Compromised injection port size
Gas-lift optimisation is difficult but critical
Limited or no survey and well test data available
Subsea GL flowmeters are unreliable
GL flow control is effectively choke position control
Unloading valve failures are difficult to identify
Cold lift gas may cause hydrate problems
Leaking check valves jeopardise well integrity
Shell UK Exploration and Production