Maureen oil field

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Maureen oil field
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Location of Maureen oil field
CountryUnited Kingdom
RegionCentral North Sea
Location/block16/29a
Offshore/onshoreOffshore
Coordinates 58°01′52″N01°42′06″E / 58.03111°N 1.70167°E / 58.03111; 1.70167
OperatorPhillips Petroleum
OwnerPhillips Petroleum Company UK Ltd (33.78%), Fina Exploration Ltd (28.96%), AGIP UK Ltd (17.26%), Century Power & Light Ltd (11.5%), and Ultramar Exploration Ltd (8.5%).
Field history
DiscoveryFebruary 1973
Start of production14 September 1983
AbandonmentOctober 1999
Production
Current production of oil70,000 barrels per day (~3.4×10^6 t/a)
Recoverable oil (million tonnes)20
Producing formationsPaleocene sandstone

The Maureen oil field is a partially depleted crude oil field in the UK sector of the central North Sea, 262 km north-east of Aberdeen. Oil was produced from the field reservoir by the Maureen A platform between 1983 and 1999. Proposals to further exploit the residual hydrocarbons in the field have yet to be implemented.

Contents

The field

The Maureen oil field is located in Block 16/29a of the UK North Sea continental shelf. [1] The Maureen field was discovered in February 1973; the oil reservoir comprises a Paleocene sandstone at a depth of 8,300 to 9,000 feet (2,530 to 2,743 metres). [2] The reservoir and its fluids have the following characteristics: [2]

Maureen reservoir and fluids
ParameterValue
API gravity 35.6°API
Gas Oil Ratio 500 standard cubic feet/barrel
Sulfur contentNil
Initial recoverable reserves125–150 million barrels, 28 million tonnes

Near Maureen are three small fields, Morag, Moira and Mary which were produced through the Maureen facilities. [3]

Owners and operators

The owners of the field in 1985 were Phillips Petroleum Company UK Ltd (33.78%), Fina Exploration Ltd (28.96%), AGIP UK Ltd (17.26%), Century Power & Light Ltd (11.5%), and Ultramar Exploration Ltd (8.5%). Phillips operated the Maureen field. [2]

Development

The Maureen field was developed by a single integrated drilling, production and accommodation platform. The principal design data of the Maureen A platform is given in the table. [2] [4]

Maureen platform design data
Coordinates58°01’52”N 01°42’06”E
Water depth, metres95.6
Fabrication of jacketAyreshire Marine Construction, Hunterston
Jacket weight, tonnes42,750 unballasted, 92,750 ballasted
Storage tanks3 off: 67 m tall x 26 m diameter
Topsides designWorley Engineering
Topsides weight, tonnes19,000
FunctionDrilling, production, storage, accommodation
Accommodation (crew)150
TypeSteel gravity base (Tecnomare design)
Well slots24 (12 production, 7 water injection)
Throughput oil, barrels per day (bpd)80,000
Storage, bbl650,000
Water injection, bpd90,000
Platform installedJune 1983
Production started14 September 1983
Oil production toStorage tanks then the articulated loading column, through a 2.3 km 24-inch pipeline
Gas production toFuel gas, surplus flared

The installation was the first steel gravity base platform deployed in the North Sea. [2] It was the largest steel structure in the North Sea when it was decommissioned in 2001. [5]

Processing

Oil from the wellheads was routed to 3-phase (oil, gas, water) separators where gas and water were removed. [2] Oil was treated to remove salt and was cooled, metered and pumped into the installation’s storage tanks. When required the oil was pumped to the Articulated Loading Column for tanker loading. The tanker loading rate was 20,000 bbl/hour. Peak production of oil was 70,000 bpd in 1984. [4] Gas from the separators was compressed in one of two trains each with four stage compressors. [2] Gas in excess of that required for fuel gas and gas lift was exported to Fulmar A and then to the St. Fergus terminal.

Water injection plant includes deaeration and fine filtration equipment; water is injected into the reservoir at up to 90,000 barrels per day. [2]

Morag field was discovered in 1979, it came onstream in 1981 and produced 2.6 million barrels prior to shutdown in 1994. Mary was discovered in 1991, it came on stream in 1991 and produced 2.83 million barrels before being shut down in June 1999. [3] Moira was discovered in 1988 and was developed as a single deviated well tied back to Maureen; It flowed at 5100 bpd and produced 4.2 million barrels before it was shut-in in 1999.

Decommissioning

The Maureen field became uneconomic in 1999 having produced 217.4 million barrels in 16 years; it was shut down in October 1999. [3] The estimated STOIIP was 397 million barrels.

In June 2001 the Maureen installation was lifted off the seabed by injecting water under the three bases and deballasting water from the tanks. [5] Once afloat six tugs towed the platform 165 nautical miles to Stord Island in Norway and broke up the structure for recycling. [5] [6] [7]

Proposals have been put forward to further exploit the residual hydrocarbons in the field. [8] None have been implemented.

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References

  1. ↑ Department of Trade and Industry (1994). The Energy Report. London: HMSO. pp. 71 and map 8. ISBN   0115153802.
  2. 1 2 3 4 5 6 7 8 Oilfield Publications Limited (1985). The North Sea Platform Guide. Ledbury: Oilfield Publications Limited. pp. 513–20.
  3. 1 2 3 Chandler, Peter M. and Barbara Dickinson (2003). "The Maureen Field Block 16/29a, UK Central North Sea". researchgate.net. Retrieved 19 October 2021.
  4. 1 2 Woolton, D. (1987). "Maureen Oil Field First Year of Production". SPE Production Engineering. 2 (1): 29–35. doi:10.2118/14549-PA. OSTI   6904321.
  5. 1 2 3 "Maureen platform decommission". ice.org. Retrieved 19 October 2021.
  6. ↑ Broughton, Peter. "Decommissioning of the Maureen oil platform" . Retrieved 19 October 2021.
  7. ↑ "The Maureen Alpha Story".
  8. ↑ "Firm has plans to revive Maureen" . Retrieved 19 October 2021.
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