Cleeton/Ravenspurn South
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The Cleeton and Ravenspurn South(RS) fields form part of BP 'Villages' complex in the Southern North Sea. They were discovered in 1976 in acreage licensed to BP in the first UK licensing round. Gas was found approximately 2,800 metres below the seabed in a water depth of no more than 50 metres.
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Cleeton and Ravenspurn South were initially developed with:
- Two fixed steel platforms - a wellhead tower (CW) bridge-linked to the production and living quarters (CP) for Cleeton and three fixed steel satellite platforms, RA, RB and RC for Ravenspurn South.
- A pipeline from Cleeton CP to shore.
- A pipeline connecting Ravenspurn South to Cleeton CP.
- A shore terminal, at Dimlington to receive gas and condensate from the Cleeton and Ravenspurn South , with the capacity for future expansion.
- A compression platform was installed on Cleeton in late 1996.
Construction work commenced with Cleeton CW in July 1986 and was completed in eighteen months.
The three platforms for Ravenspurn South were built by McDermott at Ardersier on the Moray Firth and topsides facrication was carried out by Press Offshore at Wallsend.
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In April 1987, the main gas line, flowline and the Cleeton CW were installed and production drilling of the Cleeton field began. The Cleeton CP (which is linked by a short bridge to the unmanned CW) was installed in 1988 and provided accommodation and production facilities.
The process facilities at Dimlington Terminal were commissioned in early 1988 ready for the first gas from Cleeton on 1st October, with Ravenspurn South coming on stream in Autumn 1989. The Ravenspurn South platforms are unmanned, flow rate is controlled from the Cleeton CP via a microwave telecom link and all processing is carried out on Cleeton. The production gas from the Ravenspurn South field is dried, compressed and treated condensate is injected. Finally it is mixed with the Ravenspurn North production for export through the pipeline to Dimlington. Cleeton is the central power-generating source for the Ravenspurn South offshore facilities. |
In early 1999, the Cleeton wells ceased to produce and were capped. Recovery from the reservoir totalled a high level of approximately 80%. However, in 2006 the "Attic" project recommended production from one of the Cleeton wells. This enabled further production from the Cleeton "reservoir" before being shut in during 2008.
Cleeton has been converted into a transportation hub for the Easington Catchment Area (ECA) fields with a new riser tower (CT). The first phase of ECA consisted of BG's Neptune and Mercury fields. The second phase, called Juno, included gas from BG's Artemis, Apollo and Minerva fields and BP's Wollaston and Whittle(15 kilometer to the north east of cleeton). Up to 1tcf of ECA gas may eventually come through Cleeton. Potential future developments can send their gas directly to Cleeton and Ravenspurn South or alternatively they maybe able to send it through other Cleeton satellite fields. In certain circumstances subject to the availability of blend gas it may be possible to offer a transportation and processing service for gas outside the normal entry specification. BP has also applied for a new NTS specification for BP Dimlington.
Whittle and Wollaston
The Whittle and Wollaston fields are located in block 42/28. They are approximately 15 km to the north west of the existing Cleeton platforms. The block was awarded in 1964 in the 1st licensing round with BP as operator with a 35.5% working interest. Block 42/28b was relinquished in 1978 but re-awarded back to BP in the 1978 10th licensing round.
The equity interests for the Wollaston and Whittle fields are:
- BP (operator) 35.5%
- Amerada Hess 33.73%
- British Gas 30.77%
The Whittle hub handles production from Whittle and Wollaston. This hub was developed using subsea facilities. A subsea manifold incorporating an IPS (Instrumented Protection System) is located at Whittle for tie-in of the Whittle well and the remote Wollaston well. The total production is exported to the host facility for separation prior to gas and condensate treatment. Production is exported via the processing facilities on the Cleeton CP Platform.
