25/8-19 S

Operations and results

A 9-7/8" shallow gas pilot hole was drilled to 1015 m in the Hordaland Group, just below the Skade Formation. No shallow gas was encountered.

Wildcat well 25/8-19 S was spudded with the semi-submersible installation Deepsea Bergen on 2 November 2019 and drilled to TD at 2760 m (2545 m TVD) m in Basement rock. Operations proceeded mostly as planned, but while drilling the final 6" hole to final TD the top drive service loop was damaged by a fire. Waiting for new parts and repairs caused one week NPT. The well was drilled with seawater and hi-vis pills down to 1015 m and with RheGuard oil-based mud from 1015 m to TD.

No injectite sandstone was encountered in the Eocene. Thin oil-bearing sandstone layers were found in the Paleocene Heimdal Formation, confirmed by MDT sampling. The Ty Formation massive sandstones were water-bearing, but sidewall cores indicated shows above OBM in the more porous intervals (5 - 12 % porosity). The Ty Formation sands rest unconformably on the Early Jurassic Amundsen Formation. The Amundsen Formation is a ca 20 m thick claystone unit separating the massive Ty sandstones from massive Upper Statfjord sandstones. The Upper and Middle Statfjord Group sandstones were water-bearing down to 2356 m, but good shows with bleeding oil was seen on the core from this section. Oil-bearing sandstones were encountered in the Lower Statfjord unit and pressure gradients indicated an OWC at 2386 m (2233.3 m TVD). Below this OWC an isolated pocket of oil was proven by sampling in a thin sand at 409.5 m. A 34-metre gas column in sandstone with moderate to good reservoir quality lies over an oil column of minimum 45 metres in sandstones in the Skagerrak Formation. The OWC was not encountered. Weathered and partly fractured crystalline basement is oil-bear