Orcadian Energy (CNS) Ltd, 100% and Operator
|Licence status||Second term|
|Reserves||79 mmbbls (2P)|
|Contingent resources||13 mmbbls (2C technical)
2 mmbbls (2C unaudited)
|Oil gravity ˚API||12˚-17˚|
|Reservoir oil viscosity||160 to 1,200 cP|
|Permeability (Pilot)||2 - 8 darcies|
Orcadian was awarded the P2244 licence in 2014 in the 28th licensing round. The licence is currently in the second term and contains the Pilot Main, Pilot South and Harbour discoveries. Pilot was discovered by Fina in 1989 after a successful well on the Harbour field which proved up mobile oil in the Eocene Tay sands.
These Tay sands have excellent reservoir properties with very good porosity and very high permeabilities.
The oil is viscous with API gravities ranging from 12º to 17º and reservoir viscosities which range from approximately 100 cP (like olive oil) to 1200 cP (like engine oil). A horizontal appraisal well in the most viscous region produced about 1,800 bopd. Whilst the oil is viscous, when compared to typical light oils in the North Sea, it is well within the limits where polymer flooding is considered to be effective.
We submitted a concept select report to the OGA in September 2020 and since then we have completed a polymer coreflood work programme, a polymer flood risk analysis, and emissions reduction studies. As part of that process we decided to include a floating wind turbine in the proposed development concept, the cost of this has been more than offset by the elimination of a gas import pipeline and the cost of the gas we would have purchased. We submitted a CSR Addendum to the OGA on the 1st July 2021 and the OGA provided us with a “Letter of No Objection” to our selected concept at the end of November 2021.
Sproule has audited our interpretation of the reservoir and the development scheme that we have proposed, and has endorsed our estimate that Pilot has 263 mmbbls of oil in place with proven plus probable reserves of 79 mmbbls based upon a low salinity polymer flood. The Pilot and Harbour fields have almost 15 mmbbls of additional technical or unaudited contingent resources which provide additional unrisked upside potential beyond the 3P estimate of 111 mmbbls.