Oil&Gas
Mikkel Deepwater Project
2018-01-30 15:34  点击:2
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The Mikkel deepwater project is situated at water depth of 220m of water, on Halten Bank East in the Norwegian Sea. Discovered in 1987, it lies around 35km south of Åsgard’s Midgard deposit between blocks 356407 / 5 and 6407 / 6.The field is governed by the production licence 092, which was awarded in 1984, and licence 121, which was awarded in 1986. Statoil operates the field and has a 43.97% stake in the field.Mobile Development Norway holds a 33.48% interest, Eni Norge has 14.9% and Total E&P Norge has a 7.65% interest. The other production licence PL 121 is owned by Statoil (70%), Norsk Hydro (10%) and Mobil (20%).The field was proven in 1987. It came onstream in 2003 and is tied back to the Åsgard B Platform. The project cost NKr1.8bn, which was 30% lower than the estimated cost. The reserves in the field are 28 billion cubic metres of gas and 40 million barrels of condensate, 20% higher than initial estimates. The life of the Mikkel project is 14 years and production is expected to continue until 2017. Jurassic geologyThe reservoirs over the field lie in the Jurassic sandstones, at a depth of around 2,500m. The reservoirs are found in Garn, Ile and Tofte formations in six structures delineated by faults. The fault zone where the field structure is located is known as Bremstein Fault Complex.The field has a 300m thick gas condensate column and a thin underlying oil rim. Pressure depletion is adopted for recovery.Mikkel developmentThe production concept consisted of four production wells producing into two subsea templates, with manifolds, three christmas trees, umbilicals, jumpers and a control system. However, the field was developed with two subsea templates along with three production wells. The project is one of the first few fields for which Åsgard Development has supplied the necessary infrastructure. The wells are tied back to the subsea installations on Midgard for onward transport to the Åsgard B gas platform. The wellstream is piped through the Åsgard Transport trunkline to Kårstø for the separation of the NGL.Installation of a compressor to monitor the pressure in the field’s pipeline has been planned.Project contractsStatoil had announced three early contracts, even though the plan for development and operation was not approved by the Ministry of Petroleum and Energy until September 2001. FMC Kongsberg Subsea is the main subsea production contractor for the Mikkel project. The company designed and manufactured the subsea production systems, including templates and wellheads. The value of the contract was just under NKr400m. Transocean Searcher semisubmersible rig was selected for drilling at the field in December 2001. Reinertsen Engineering designed the subsea pipelines and control cables under a contract valued at NKr6m. The field required design modifications to the Åsgard B platform, to receive the well flow from Mikkel. This contract is for NKr30m.The contract for providing the 25-mile long, 18in-diameter pipeline connecting the project subsea development with Åsgard facilities was given to European Marine Contractor. Nexans was awarded the contract for supplying 75km umbilical cables in July 2001. The contract for providing an online production management system for the field, along with other fields of the company including Midgard and Yttergryta, was given to SPT Group in April 2009. The production management system will be integrated into an online e-field solution.Around 90% of deliveries for the project development came from Norwegian fabricators and suppliers.
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