The paper provides an overview of and operating experiences with the subsea power supply systems for the Statoil fields utilizing high voltage power; Lufeng (seabed booster pumps), Troll (oil/water separation, water re-injection) and Tordis (separation, boosting, water re-injection). The paper gives a status on performance of the power system for these projects, and an overview of the most important "lessons learned". The Tyrihans pump power supply system, which represents the world's longest step-out with topside VSDs and highest subsea motor power, is also briefly presented.Future fields utilizing subsea processing at deeper waters and with longer tie-backs will require further development of power system technology and Statoil is undertaking several qualification programs for such applications. Status of Statoil's main ongoing qualification programs within HV power is given, including R&D and study activities. The overview includes status on all main power supply components such as motors, connectors, VSD, switchgear, transformers and cables/umbilicals within these projects.The information provided gives a good overview of "state of the art" of subsea HV power systems and components within Statoil, and can be useful to both manufacturers and end users of subsea power components.
Ormen Lange is a long tieback gas field developed with gas processing facilities onshore 120 km from the production wells. The development strategy is pressure depletion. In order to maintain the production plateau for as long as possible and recover the anticipated gas and condensate resources, offshore compression is required to maintain production. This paper describes subsea compression as a cost effective alternative to the platform compression solution and the strategy for qualifying subsea compression system prior to offshore compression concept selection. This paper further describes the subsea compression technical solution. Introduction Ormen Lange is a gas field located 120 km off the northwest coast of Norway on the Norwegian continental shelf, in water depths varying between 850 and 1,100 meters. The reservoir covers an area 40 km long, 8 to 10 km wide and 3,000 meters below the surface. Recoverable reserves are estimated to approximately 397 billion Sm3 dry gas and 28.5 million m3 condensate. Ormen Lange has been in production since October 2007.
Ormen Lange is a long tieback gas field developed with gas processing facilities onshore 120 km from the production wells. The development strategy is pressure depletion. In order to maintain the production plateau for as long as possible and recover the anticipated gas and condensate resources, offshore compression is required to maintain production. This paper describes subsea compression as a cost effective alternative to the platform compression solution and the strategy for qualifying subsea compression system prior to offshore compression concept selection. This paper further describes the subsea compression technical solution.
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