Apache drilling side-track in injectite playSources: OGA and NPD

Apache drilling side-track in injectite play

Well 9/19b-29Z kicked off last week, probably further appraising the UK extension of the Froskelår and Gamma discoveries.

As reported by the OGA, well 9/19b-29Z spudded on Monday last week (16/11) in UK Licence P1986. Classified as an exploration well, it is likely that it further appraises the UK-continuation of the Froskelår/Gamma discoveries.

Parent well 9/19b-29A was spudded on 28th September and was completed on Monday last week (16/11), after the rig had moved 130 m with respect to the original 9/19b-29 location that was spudded 14th September this year.

Froskelår discovery

Last year, Aker BP announced the discovery of Froskelår upon completion of well 24/9-14S. It encountered a gas column of 30 m, and an oil column of 38 m in Eocene sandstone injectites of 35 m thick, mainly with very good to excellent reservoir properties. The sandstones are interpreted as being remobilised sands from the Heimdal and Hermod formations in the Paleocene which are injected into the overlying Hordaland Group. The gas/oil contact was observed in the well. The oil/water contact was not observed, as the logs showed an oil down to situation.

A technical horizontal side-track (24/9-14A) was drilled to test the lateral extent of the injectite complex and its reservoir properties.  It encountered several gas-bearing and oil-bearing injectite zones totalling 540 m, with many sandstone layers with variable thickness and variable reservoir properties, mainly from good up to excellent. The gas/oil and oil/water contacts are the same as in the main well.

The size of the Froskelår discovery was estimated between 60 and 130 MMboe recoverable.

Gamma discovery

The smaller Gamma discovery (24/9-3) overlaps with Froskelår and is seen as part of it because is it is in pressure communication. Discovery well 24/9-3 was already drilled in 1981 by Conoco to test a structure that turned out to be a water-wet Paleocene sands, but Eocene sands were found to be oil bearing.

Read more: injectite play

HENK KOMBRINK

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