The spud date for the well has been moved back from that previously announced due to operational considerations on the preceding well (operated by another party).
Wellington 1 is a three-way dip, fault-bounded closure targeting the Jurassic aged Rona Sandstone at a location 65 km south-west of the giant Clair Field (currently producing at approximately 23,000 bopd) and 45 km south east of the Foinaven Field (currently producing at approximately 58,000 bopd). The nearest onshore oil facilities are located in the Shetland Islands at Sullom Voe some 140 km to the east.
Wellington 1 is to be drilled using the Bredford Dolphin semi-submersible drilling rig, in approximately 148 meters of water. The location is situated on a prominent geological feature (the Rona Ridge), and the primary target depth is expected to be relatively shallow (approximately 1,005m RT).
The operation from rig mobilization to the planned plugging and abandonment of the well is estimated to take about 18 days (including some contingency). The Wellington 1 location is mapped to be at the Jurassic structural crest on the regionally significant Rona Ridge and in a location where it is predicted that good-quality near-shore, marine-reservoir rocks will be encountered.
The principal source rocks considered to have provided hydrocarbon charge to Wellington is the world-class Kimmeridge Clay Formation. The quality of this unit as a source is evidenced by the substantial discoveries and production that has occurred in the North Sea to date.
Sunshine believes that the Wellington location is well-placed to receive hydrocarbon charge from mature Kimmeridge Clay Formation from either the Faroe or Papa Basins to the northeast and south respectively. The primary reservoir target is the Jurassic aged Rona reservoir section, which has been intersected in several wells in the area. It is expected to have the potential for excellent reservoir quality at the Wellington location, given its interpreted near-shore marine depositional facies across the Wellington area.
The Triassic Otterbank Sandstone, which has been demonstrated to contain an oil accumulation within Sunshine's permit at the Strathmore Field (as yet undeveloped), is a secondary objective of the well.
Based on the operator's mapping and probabilistic reserve assessment of the Rona Sandstone target (Hurricane Exploration plc, July 28, 2006), the Wellington structure could potentially contain up to 214 million barrels of recoverable oil (mean case), and in a high-side success case (P10) could contain as much as 460 million barrels of recoverable oil.
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