7219/12-1 A

General

Well 7219/12-1 A is an appraisal of the 7219/12-1 Filicudi oil and gas discovery in Late Triassic sandstones of the Tubåen Formation. The objective of the appraisal was to test the hydrocarbon potential and reservoir properties of the Early Jurassic Nordmela Formation and the Upper Triassic Tubåen Formation in the fault block to the East of the main Filicudi prospect. The appraisal should confirm pressure communication and similar hydrocarbon types and contacts as in the main wellbore.

Operations and results

Appraisal well 7219/12-1 A kicked off at 670 m from main wellbore 7119/12-1 on 19 January 2017. It was drilled with the semi-submersible installation Leiv Eriksson to TD at 2026 m (1825 m TVD) m in the Late Triassic Fruholmen Formation. Operations proceeded without significant problems. The well was drilled with Performadril water-based mud (3.2 – 3.6 % glycol) from kick-off to TD.

Top target reservoir, Early Jurassic Nordmela Formation sandstone, was encountered at 1699 m (1516.3 m TVD), overlying Late Triassic to Early Jurassic sandstone of the Tubåen Formation. The sandstones were gas and oil bearing with GOC at 1756.5 m (1568.5 m TVD) and the OWC between 1818 m to 1823.5 m (1624.5 m to 1630 m TVD). Two gas gradients were seen, the upper interval, above ca 1735 m is 2 bar less than the lower interval. The oil is heavy, with stock tank density 0.956 to 0.959 g/cm3.

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