Well: Hades/Iris 6506/11-10

Operation type: drilling

Well: exploration well

Reservoir: HPHT

Conditions: harsh

Trajectory: vertical

Location: Halten Terrace, Norwegian Sea

Rig: Deepsea Bergen (Aker H-3)

Case: dynamic rig heave calculated retrospectively to explore potential savings

"Simulations from Heavelock Solutions help us to achieve better results in well engineering – we use them actively in our well design process and when we develop our operational procedures.”

- Dag Helge Breivik, Drilling Manager - OMV

OMV 6506/11-10 Hades/Iris

Risk/concern

Potential savings

OMV 6506/11-10 Hades/Iris

OMV Norge was one of the first companies to utilize simulation services from Heavelock Solutions in well planning. Drilling Manager Dag Helge Breivik (OMV) explained why during an interview with Teknisk Ukeblad in 2019:

“We used Heavelock Solutions on two occasions: for well planning on the Wisting field in the Barents Sea and on Hades/Iris in the Norwegian Sea... We plan to conduct drilling operations all year around in the Barents Sea. It is thus important for us to be on top of things and know in advance what kind of consequences rig heave might have in our wells... Hades/Iris is a high-pressure high-temperature (HPHT) field and our goal here is to have as low mud weight as possible during drilling. But we cannot reduce the mud weight so much that we get problems related to surge & swab, induced by rig heave. Simulations from Heavelock Solutions help us to achieve better results in well engineering – we use them actively in our well design process and when we develop our operational procedures.”

RISK/CONCERN

HPHT reservoir - the well was originally planned to be finished with an 8 ½” hole only but ended up with 7” contingency liner and 6” hole for lower Iris part. Waiting on weather with riser disconnections was expected due to harsh conditions on the Halten Terrace wintertime.

POTENTIAL SAVINGS

The plot to the left shows rig heave limit simulated for drilling of the 8-½’’ section. Sticking to the simulated dynamic heave limit at the 9-7/8’’ shoe depth would have saved almost 2 days of WOW resulting in at least $1,000,000 in savings.

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