The recently discovered huge Lancaster oil well off eastern Shetland is so big that it spills over into the adjoining exploration licensing block, according to the Hurricane Energy exploration company.
Hurricane – which focuses on hydrocarbon resources in naturally fractured basement reservoirs – has now spudded the ‘spill-over’ well 205/23-A (the “Halifax Well”).
The recently drilled Lancaster Pilot well (205/21a-7) encountered a minimum oil down to (ODT) of 1,620m TVDSS, indicating that the Lancaster oil accumulation is likely to extend beyond the Lancaster licence boundary.
The recently awarded P2308 licence (“Halifax”) is contiguous to, and extends north east from, Hurricane’s existing Lancaster licence.
Hurricane Energy believes that if ‘mobile oil’ can be demonstrated outside of local structural closure by the Halifax Well, then the Lancaster field could extend further north east along the Rona Ridge.
A previous well (205/23-2) drilled on the Halifax structure encountered oil and gas shows in sandstones immediately above the basement. In addition, Hurricane’s analysis of basement cuttings from the 205/23-2 well indicates the presence of oil thus mitigating the oil charge risk to Halifax.
Seismic interpretation indicates the presence of a well-defined fault network within the fractured basement of the Halifax Prospect, analogous to that seen in Lancaster.
Hurricane now plans to drill the Halifax well below local structural closure and will then perform an open hole drill stem test. In the event of a successful such test, it is envisaged that the well will be deepened to investigate the oil-water contact.
Dr Robert Trice, Chief Executive, Hurricane Energy, said: “This has already been a hugely successful drilling campaign for Hurricane and the Halifax well marks an exciting opportunity with which to close it.
“The prospect is also a logical conclusion to the drilling programme as, following the success of the Lancaster Pilot Well, we believe that the oil column extends beyond the Lancaster block boundary and potentially up to the Halifax Prospect.”
Test-drill results are likely to be issued by the end of March 2017.