Field/project development

Design-to-Cost Approach Increases Project Value of Troll Phase 3

This paper describes an effort to increase value creation in Troll Phase 3 by reducing the pressure drop along the value chain from the reservoir through the wells, subsea systems, pipeline, and tieback.

36-in. U-shaped tie-in spool.
Fig. 1—36-in. U-shaped tie-in spool.
OTC 30954.

An important driver for maximizing value creation for the Troll Phase 3 gas project offshore Norway was to identify ways to reduce the pressure drop in the value chain from the reservoir to the onshore terminal. Using a design-to-cost approach in the concept-selection phase has affected design of the wells, subsea production system, pipeline, and a new inlet separator on the platform. The final design has enabled a significant increase of project value by accelerated gas deliveries, reduction of energy consumption, and lowered CO2 emissions.

Troll Phase 3 Business Case and Development Concept

The Troll Phase 3 business case is to develop the vast gas reserves in Troll West, thus recovering approximately 340 billion std m3 gas over a 40‑year period. Production from Troll West will be commingled with Troll East gas production at Troll A. The Troll West volumes will supply approximately 40% of the total Troll A delivery and enable a 5-year continuation of the current high plateau production level of 36 billion std m3/yr and an extension of field lifetime by 15 years until 2062. A prerequisite for the Phase 3 project is that the annual summer/winter swing production will be from the Troll A wells.

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