Experience in operating World's first Subsea Separation and Water Injection Station at Troll Oil Field in the North Sea
摘要
In May 2000 Norsk Hydro reported, by means of an OTC paper, that Troll Pilot would be ready for start-up in June of that year. The Pilot was indeed started at that time. However, failures in the electrical connector system developed in the subsea installation shortly after start-up. This triggered the Repair and Upgrade Project which involved several interventions on the Troll Pilot subsea station during the summer of 2001. These repair activities, which focused on subject electrical interfaces and corresponding marine operations, were presented by an OTC paper in 2002.
Following the repair operations, Troll-Pilot was started in August of that year and it has now been in continuous operation, reporting 100% availability, since August 2001.
This paper will focus on presenting experience in operating the separator station and relate this to the defined operational and design strategies. Issues to be covered as a spin-off from subsea separation are implications on flow assurance and variance in the well fluid entering the separator system.
The paper will also cover risk of installing a subsea separator system and relating this to the regularity experience of the station, giving feedback on main components used on the station.
The Troll Pilot Separator Station is installed on the Troll Field at 340 m WD approx 3,5 km from the Troll-C Production platform. This province of the Troll field will be developed with more than 50 subsea wells. Troll-Pilot is installed in a production loop system with two production templates giving a total capacity of 8 well-slots. At the moment 6 wells has been completed and hence available for the separator station.
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