Hydraulic Interventions Increase Injectivity Rate 300% and Cut Costs by 30%, Schiehallion Field | OneSubsea
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Case Study

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

Photo of a subsea safety module with an integral mudmat being deployed on wire.
Subsea safety module with integral mudmat deployed on wire.
Photo of an ROV connecting the injection downline to the subsea safety module.
ROV connecting the injection downline to the subsea safety module.

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.

Location
North Sea, United Kingdom, Europe, Offshore
Details

Hydraulic intervention method cut costs by 30% and improved injectivity up to 300%.

Products Used
MARS
Multiple application reinjection system

Universally interface with all trees—topside and subsea.
SMIS
Subsea modular injection system

Improve operational safety and cost effectiveness.