Dynamic Simulation as a Tool in the Design of an Offshore Gas Compression System

Abstract

Den norske stats oljeselskap a.s. (Statoil) commissioned Special Analysis & Computing Services (SACS) to perform a number of extensive dynamic simulation studies of the Statoil Gullfaks ‘A’ natural gas compression, re-injection and associated control systems during the initial and final design stages of the project. The simulation study addressed the behaviour and application of the control systems to the turbo compressor units with regard to the process operability and flexibility. In addition, the work also addressed system behaviour during start-up shutdown and after equipment failure. The interrelationship between the control systems and the compression units which dictate the overall process behaviour was shown and recommendations made about the process control systems to ensure satisfactory operation and provide operational flexibility. The study generated advanced knowledge of the plant behaviour for a number of design options and resulted in recommendations and information which will benefit the commissioning team and operations personnel.