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Aker BP likely to downgrade resource estimate for Liatårnet discovery

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Oilfield Technology,


Aker BP has concluded the drilling of appraisal well 25/2-22S on the Liatårnet discovery in licence 442 in the North Sea.

The well encountered lower volumes of hydrocarbons than expected. Pending further analysis, the preliminary results indicate that a downward adjustment of the resource estimate for the discovery is likely.

Liatårnet was discovered in 2019 and was considered as a potential resource addition to the NOAKA development, however not included in the NOAKA resource base. The results of this appraisal well will not impact the NOAKA development project. Furthermore, the results from this well do not impact Aker BP’s exploration strategy in the area.

The well was drilled about 40 km northeast of the Alvheim field in the North Sea, and about 200 km northwest of Stavanger.

Discovery 25/2-21 (Liatårnet) was proven in 2019 in reservoir rocks from the Miocene Age (the Skade Formation).

Before appraisal well 25/2-22 S was drilled, the operator’s resource estimate for the discovery was between 13 and 32 million m3 of recoverable oil.

The primary exploration objective for the well was to take liquid samples to clarify the quality of the oil proven in the Skade Formation in well 25/2-21 (Liatårnet). The secondary exploration objective was to collect geological information on formation strengths and to prove the oil/water contact.

Well 25/2-22 S encountered 31 m with the same reservoir interval as well 25/2-21 (Liatårnet), with extremely good porosity and moderate permeability. The uppermost 5 m contain traces of oil. Estimated oil saturations and liquid samples collected in the reservoir interval indicate that the oil in this well cannot be produced. The oil/water contact was not encountered.

The results show that the appraisal well will entail a downward adjustment of the resource estimates in the Skade Formation in 25/2-21 (Liatårnet), but it is too early to give an updated estimate for the discovery.

The well was not formation-tested, but extensive data acquisition and sampling have been carried out.

This is the tenth exploration well in production licence 442. The licence was awarded in APA 2006.

Appraisal well 25/2-22 S was drilled to respective vertical and measured depths of 1767 and 1772 m below sea level, and was terminated in rocks from the Oligocene/Eocene Age (the Hordaland Group).

Water depth at the site is 111 m. The well has been plugged and abandoned.

The well was drilled by the Deepsea Nordkapp drilling facility, which will now proceed to the Alvheim area in the North Sea to drill a development well in production licence 150, where Aker BP is the operator.


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Read the article online at: https://www.oilfieldtechnology.com/drilling-and-production/01092021/aker-bp-likely-to-downgrade-resource-estimate-for-liatrnet-discovery/

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