30/9-14

General

Well 30/9-14 is located in the western part of block 30/9, on the Southern Oseberg complex. The primary objectives of the well were to appraise oil within the G-North prospect and verify the potential resources of the G-North and G-West prospect, leaving a minimum of untested resources up dip of the well on the G-North prospect; to define fluid contacts, primarily the OWC in the Tarbert Formation; and to verify the structural mapping, depth conversion and the geological model for the G-North area. Secondary objectives were to verify the lateral extent of the lower Heather sand, to test a possible hydrocarbon potential within the Ness and ORE (Oseberg/Rannoch/Etive) Formations, and to obtain a good well tie of the base Brent reflector and the intra Dunlin reflector.

Operations and results

Appraisal well 30/9-14 was spudded with the semi-submersible installation "Polar Pioneer" on 16 March 1993 and drilled to total depth at 3680 m in the Early Jurassic Drake Formation. The well was drilled water based with sea water and hi-vis pills in the 36", 24", and 17 1/2" sections, down to 1040 m, and with a KCl / PHPA / Polymer mud from 104 m to TD. Sedimentological and lithological development was similar to 30/9-13 S, but approximately 250 m of Early Oligocene sand encountered in well 30/9-13 S was not present in well 30/9-14 where the same interval is dominated by clay stone. The Viking Group came in at 2967 m and the Top Tarbert Formation came in at 3059.5 m, 84 m deeper than prognosis due to too low velocities in the Tertiary section. Sixty-six m of Intra Heather Sandstone was verified from 2993.5 m to 3059.5 m. Poor to moderate shows were observed in the Draupne and Heather Formations from 2968.5 m to 3059.5 m. Moderate to good shows were seen from 3059.6 m to 3130 m in the Tarbert Formation. Good shows (residual oil) were also observed in the ORE Formation from 3503 - 3514 m. The Lower Heather and upper Tarbert Formations were proven to