Calsep PVTsim User Group

Statoil on multi-phase meter data unification. Calsep outlines new ‘Nova’ PVTsim edition.

A Statoil presentation at the Calsep1 User Group meeting this month described how the company is unifying its multi-phase meter allocation solutions. Multi-phase meters are used to determine gas oil and water flow rates upstream from the separator but their use requires a significant calibration effort. This is achieved through simulation of phase densities and volume conversion factors. Statoil had three different MPM solutions working on different fields and decided to unify these under a single PVTsim-based DLL2 with different entry points for each field. The DLL was developed as a VBA.NET plug-in to Excel. Statoil’s unified MPM solution is now being tested and has been extended to use on another field. The DLL has also been used to run PVTsim under control from Honeywell’s UniSim.

Calsep has embarked on a major revamp to ots PVT3sim flagship. The new PVTsim ‘Nova’ release is being developed to assure continuity for PVTsim. PVTsim allows reservoir engineers, flow assurance specialists and process engineers ‘to combine reliable fluid characterization procedures with robust and efficient regression algorithms to match fluid properties and experimental data.’ Data is then available for use on reservoir, pipeline and process simulators. Originally released in 1988, PVTsim is the PVT engine inside SPT Group’s ‘Olga’ dynamic flow simulator.

Nova adds new functionalities and models and will be easier to maintain and extend with new database content thanks to a code rewrite by ‘professional’ programmers and modern tools. Nova targets enhanced oil recovery, flow assurance and new thermodynamic models. An ‘open structure’ improves database communication and links from 3rd party software. Nova also allows clients to add their own algorithms, simplifies reporting with links to Excel and Word and adds industry standards reporting and compliance.

For more User Group presentations including a flow assurance and wax deposition study on an offshore Norwegian field, on hydrate inhibitors and on the development of an equation of state model for an gas injection EOR project on KOC’s Sabriya field, visit

1 CALculation of SEParation processes.

2 Dynamically linked library.

3 Pressure, Volume, Temperature.

This article originally appeared in Oil IT Journal 2010 Issue # 12.

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