Negative Rig specific LL with Wellesley

Kallåsen (35/12-6 S) – Reservoir section

What happened:

Investigated two sensor systems in TT.

What was planned:

Trip sheets for volumetric control

What was learned:

The less volume in TT then 9 m3, the bigger difference between the Geoservice and TOA sensor (Geoservice shows higher volume then TOA). At low volumes the difference is +/- 100-150 litre.
The higher volume in TT then 9 m3 the bigger difference between the Geoservice and TOA sensor, but in reverse effect (Geoservice shows lower volume then TOA). When TT is 9 m3, both sensors is showing same volume.
NOTE: This was observed during RIH with 8 1/2” coring assembly.

What actions are required:

Transocean have continued to attempt to calibrate their trip tank sensor against the Geoservice sensor without success and are looking to source a new sensor.