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Ten more years for Troll B
THE AUTHORITIES HAVE GRANTED CONSENT TO OPERATOR EQUINOR AND THE OTHER LICENSEES FOR A TEN-YEAR LIFETIME EXTENSION FOR the Troll B facility in the North Sea. The extended lifetime for Troll B also includes the oil and gas pipelines that were included in the approved Plan for Development and Operation (PDO).
The current consent expires in September this year. The Troll B start-up date was in September 1995. Extension of Troll B’s lifetime to 2030 is one of the potential solutions for further developing gas production from the Troll Vest gas cap, Troll phase three. Nine seismic surveys have been carried out on the Troll field, with the last one completed last summer. All previous surveys have contributed to identify new well targets. The licensees expect the results from processing the data from the latest seismic survey will yield additional well targets. These can be drilled from the subsea templates tied to Troll B. “Extended operation of Troll B secures a foundation for good resource management of significant oil and gas resources from the gigantic Troll field,” says Arvid Østhus, Assistant Director Development and Operations, North Sea in the NPD. The Petroleum Safety Authority has also approved extended operation and believes that Troll B can be safely operated until the end of the licence period, based on an assessment of current technical integrity. This requires maintenance and modifications according to the lifetime extension plan.
40% of total gas reserves Troll is a field in the northern part of the North Sea. The water depth is 300 - 330m. Troll was discovered in 1979. Located about 60km west of Sognefjorden, the Troll field is the most prolific field on the Norwegian Continental Shelf. Even after twenty years of production, less than half of the reserves have been produced. The field comprises the main Troll Øst and Troll Vest structures >>
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Extension of Troll B’s lifetime to 2030 is one of the potential solutions for further developing gas production from the Troll Vest gas cap, Troll phase three.
Image courtesy of Equinor.
in blocks 31/2, 31/3, 31/5 and 31/6. Containing about 40% of total gas reserves on the Norwegian continental shelf (NCS), it represents the very cornerstone of Norway’s offshore gas production. Troll is also one of the largest oil fields on the Norwegian continental shelf. Equinor operates the Troll A, B, and C platforms and the landfall pipelines, while Gassco is operator for the gas processing plant at Kollsnes on behalf of Gassled.
Phase 3 The enormous gas reservoirs 1,400m below sea level are expected to produce for at least another seven decades. Troll Phase 3 is currently being developed for the exploration of the large gas reserves in the western part of the Troll field. The field is located about 25km north-west of the Troll A platform. The development concept includes a subsea development system consisting of two subsea templates (each with four well slots), eight production wells, and tie-in to the Troll A platform. Troll Phase 3 will be powered from shore through the Troll A platform, ensuring very low CO 2 emissions. The world’s largest pipelaying vessel Allseas’ Solitaire recently completed laying 26km of new pipeline between the Troll A platform and the new subsea
Photo courtesy of Allseas.
The world’s largest pipelaying vessel Allseas’ Solitaire recently completed laying 26km of new pipeline between the Troll A platform and the new subsea installations of the Troll Phase 3 project.
installations of the Troll Phase 3 project. Troll Phase 3 is scheduled to come on stream in the second quarter of 2021.
