The operator’s goal

Water injection wells within the Schiehallion Field west of Shetland were suffering from reduced performance due to scale build-up in the reservoir.

What we recommended

Perform cost-effective hydraulic intervention using the OneSubsea subsea modular injection system (SMIS) comprising

• subsea safety module
• MARS multiple application reinjection system for optional choke access
• downline emergency quick-disconnect system
• personnel to supervise the operations.

What was achieved

Three wells were successfully intervened during 2018 and 2019, with plans for 8 wells in 2020. Overall, using the hydraulic intervention method recommended by OneSubsea, the operator cut costs by 30% versus conventional intervention methods. The wells saw a significant injection rate increase as the injectivity improved up to 300%.

Technical details

For more information, read SPE-199818.