Schiehallion Field Extended Well Test

abarrelfullabarrelfull wrote on 06 Aug 2012 11:46

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21 August 1995

BP Exploration, on behalf of the Schiehallion co-venturers, today announced that an extended well test has been completed successfully on the Schiehallion field, some 150 kms west of Shetland.

Between April and June 1995, the semi-submersible drilling rig Henry Goodrich drilled the well, 204/20-5, to a total measured depth of 4,000 metres, with a horizontal section of 1,700 metres.

The test began on 1 June 1995 and was completed on 20 July. During this seven week period, well 204/20-5 flowed at up to 20,000 barrels a day of 26 degrees API oil, with an average stabilised flow rate of 18,000 barrels a day. Some 714,000 barrels of oil were processed and stored in the dynamically positioned tanker M/T Savonita.

The extended well test was carried out on behalf of the licence partners by a consortium led by Victoria Oilfield Development and on completion the cargo of oil was taken to BP's Rotterdam refinery.

Schiehallion lies in 375 metres of water in UK blocks 204/20, 204/25b, 205/16 and 205/21b, all operated by BP, and 204/25a, operated by Amerada Hess.

Participants in blocks 204/20, 204/25b, 205/16 and 205/21b are:-

  • BP Exploration (Operator) 50%
  • Shell UK Exploration and Production 50%

Participants in block 204/25a are:-

  • Amerada Hess Limited (Operator) 47.05%
  • Aran Energy Exploration Limited 17.65%
  • OMV (UK) Limited 17.65%
  • Murphy Petroleum Limited (a subsidiary of Murphy Oil Corporation) 17.65%

Notes :
The Schiehallion discovery well, 204/20-1, was drilled by BP on ninth round acreage by the semi-submersible rig Ocean Valiant in the autumn of 1993.

The successful test of well 204/25a-2, announced by Amerada Hess and its co-venturers in October 1994, confirmed the extension of Schiehallion into Block 204/25a.

In February 1995, BP and Amerada Hess signed a Joint Appraisal Agreement to provide a framework for studies to determine the commercial potential of Schiehallion. The main elements of the programme were the appraisal wells 204/25a-3 drilled by the Dyvi Stena and 204/20-5 drilled by the Henry Goodrich.

On 14 June 1995, BP announced that it had commissioned the Atlantic Frontier Alliance - a consortium of Brown & Root, Single Buoy Mooring and Harland and Wolff - to begin preparatory work on a floating production system for the second stage of its West of Shetland discoveries. It is intended that the vessel will be sited over the Schiehallion field.

The initial phase of the contract, worth about £14 million, will cover early work on key aspects of the scheme, including design and engineering.

Subject to the necessary consents being obtained, first production is scheduled for late 1997 and oil would be produced through subsea wells into a steel floating production storage and offtake vessel (FPSO) stationed permanently in the field with export by shuttle tanker.

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