NESSE SBM#6IWC - Intelligent Well Completions
Installation & Well Control Challenges
Benni Toldo - Completions Engineer
Woodside - Perth, Australia
Slide 2
Well Control during IWC installation
• IWCs are typically installed without a reservoir isolation barrier (eg FIV)
• String motion generated from rig heave can induce to a well influx
• Main parameters affecting the swabbing effect:
- Rig motion (heave and amplitude)
- Completion design: Flow paths across the completion
- Clearances: flow areas open to fluid movement
- Wellbore Fluid viscosity
Pswab < Pres risk of well influx
Looking for other Operator’s experience
Slide 3
Well Control during IWC installation
Run In hole 9-5/8" Production Packer
7" Isolation Packer #4
7" Isolation Packer #3
7" Isolation Packer #2
7" Isolation Packer #1
Upward string movement can swab the formation
gas
Wellbore Influx
9-5/8" Production Packer
7" Isolation Packer #4
7" Isolation Packer #3
7" Isolation Packer #2
7" Isolation Packer #1Annulus isolation
with control lines across could be problematic
gas
Well Killing 9-5/8" Production Packer
7" Isolation Packer #4
7" Isolation Packer #3
7" Isolation Packer #2
7" Isolation Packer #1
Can we kill all the zones effectively and proceed landing the completion?
gas
Kill fluid
Slide 4
Well Control during IWC installation
• Swabbing effect is greater for 3+ zone completions
• Risk is higher for gas wells
Risk Mitigations:
• Running Speed
• Increase overbalance
• Packer Clearance
• Control fluid viscosity
• Impose rig heave restrictions
95 psi
150 psi
4 Zone SMART in Viscous polymer
95 psi
150 psi
4 Zone SMART in Viscous polymer
How do we model this?
Any experience good/bad to share?