OCTIO completes 4D gravimetry survey for Equinor’s giant Troll field

OCTIO has successfully completed the gWatch survey acquired over the giant Troll field. The operation was conducted using the Havila Subsea vessel and was completed with unprecedented efficiency with no equipment downtime. The average uncertainty for the measurements for the survey was 0.5 µGal and 2.1 mm.

Equinor uses 4D gravity and subsidence data to optimize the field production. At Troll, results from previous surveys enabled Equinor to map gas water contact and  pressure communication over the field. The results provide valuable input for reservoir management decisions for the field.

OCTIO gWatch instrumentation features industry-leading sensitivity and can detect changes in the gravitational field at the seabed at the level of one part in 1,000,000,000.  Such high precision allows gWatch to sense modest changes in fluid concentrations and properties within the reservoirs.

License partners at the Troll field are Equinor Energy AS (operator), Petoro AS, A/S Norske Shell, TotalEnergies E&P Norge AS & ConocoPhillips Skandinavia AS

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