West of Shetland well could lift Lancaster oil estimate

Offshore staff

GODALMING, UKHurricane Energy says testing and logging operations have finished on the 205/21a-7 pilot well on the Lancaster oil field west of Shetland.

Operations are under way to permanently abandon the pilot well reservoir section prior to side tracking the top-hole to form the 7Z horizontal side track.

Results so far indicate a substantial hydrocarbon column of at least 620 m (2,034 ft) is present within the basement extending well below structural closure of 1,380 m (4,527 ft) TVDSS, confirming Hurricane’s reservoir model for the field.

Provisional analysis suggests a minimum oil down to at 1,620 m (5,315 ft) TVDSS, 240 m (787 ft) TVD below structural closure. Wireline fluid samples have demonstrated mobile oil of a gravity consistent with Lancaster oil to a depth of 1,646 m (5,400 ft) TVDSS.

The penetrated aquifer interval is porous and permeable and wireline and well test data indicate that no pressure barriers have been detected in the reservoir.

Drillstem testing of the basement reservoir delivered a maximum, natural flow rate of 6,600 b/d, rising to 11,000 b/d using artificial lift via an electrical submersible pump. Good quality 38° API oil was produced with no formation water.

This flow is thought to emanate chiefly from a single fracture zone connected to the underlying basement. 

The horizontal well is designed to provide a second future producer for the development, as well as assisting development planning.

Dr. Robert Trice, Hurricane’s CEO, said the results suggest Lancaster holds substantially more oil than the 200 MMbbl 2C case, and underlines the potential of the fractured basement west of Shetland.


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