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?