6506/9-4 S

General

Well 6506/9-4 S was drilled appraise the 6506/9-2 S Fogelberg discovery. The Fogelberg discovery is located on a small fault block on the Halten Terrace, north-northwest of the Smørbukk Field and northeast of the Morvin Field. The primary objective was to reduce the volume uncertainties of the discovery by establishing the hydrocarbon contacts within the Garn and Ile Formations, verifying reservoir quality, and collecting representative fluid samples.

Operations and results

A 9 7/8" pilot hole was drilled to 1381 m in order to check for shallow gas. No shallow gas was encountered.

Appraisal well 6506/9-4 S was spudded with the semi-submersible installation Island Innovator on 3 February 2018 and drilled to TD at 4738 m in the Early Jurassic Tofte Formation. Low penetration rate was experienced in the Lange Formation shales in the 12 ¼” section. After logging at final TD liner was run to perform a DST. The liner hanger running tool stuck in cement, leading to a significant period of NPT. The well was drilled with seawater and hi-vis pills down to 1381 m and with RheGuard Prime oil-based mud from 1381 m to TD.

The Garn formation was encountered at 4520 m (4405 m TVD), 14 m shallower than prognosis and the top Ile Formation was picked at 4591.5 m (4475.0 m TVD), 13 m shallower than the prognosis. Approximately 67 m gross of gas bearing sandstone was proven in the Garn Formation whilst 70 m gross of sandstone with high water saturation was encountered in the Ile Formation. The gas-water contact(s) was not observed in the well. The reservoir quality of the Garn formation is variable, ranging from moderate to high, in line with the previous understanding of the reservoir. The r