This paper describes the hydrate prevention concept for an actual North Sea subsea development, and how this concept was established.

Based on the outline of the development, an extensive program of hydrate characterisation tests was performed. These tests consist of semi-static experiments in visual high pressure PVT-cells and dynamic studies in pressurised flow loops and flow simulators. Special emphasis has been put on the investigation of the potential of hydrate blockage and the future use of unconventional hydrate inhibitors.

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