Publications

This paper discusses the implementation of a new methodology for conversion and management of streams for the South Natuna Sea Block B project. This project consists of multiple satellite fields, with vastly varying PVT fluid properties and transport requirements, producing to a single processing platform (Belanak FPSO). The fields are dedicated to two Gas Sales Agreements. Reservoir simulation models have been constructed, several of which include gas re-injection.Topside / Process simulation for the design and optimization of the Floating Production Storage and Offtake vessel (FPSO) requires an aggregated compositional profile versus time. Process simulation uses a detailed equation-of-state (EOS) fluid model. Until now, no software or approach exists for automated generation of aggregated compositional streams from multiple reservoirs with different fluid PVT descriptions.In this paper, software developed by PERA a/s called Petrostream ManagementTM (PSM) is presented, which allows consistent conversions of petroleum fluid streams from one representation to another (e.g. black oil to compositional), and aggregation of streams to a common time-basis for generation of total molar streams. PSM additionally allows the modeling of surface processing, forecasting of crude properties based on assays from individual wells, and optimized phase-in and production of all participating fields to fulfill contractual obligations while honoring the facility and model constraints. PSM calculations are based on post-processing of reservoir simulation results and are extremely fast and reliable. Critical conversions are performed at the grid-connection level for consistency and accuracy.The software has proved more than adequate for the engineers requiring an integrated solution. The technology used in PSM conversions has been validated on many applications, depletion, gas injection and multiple PVT regions are easily handled. As implemented, molar rates of streams as a function of time are easily obtained for any node in the system (platform, pipeline etc.). Filtering allows extraction of molar profiles at any level of detail (well, PVT region etc.).