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RFD’s industry-leading tNavigator™ is the first and only product on the market which dynamically combines a fully interactive 3D graphical user interface and a record breaking parallel supercomputing engine. The core algorithms are based on the latest scientific developments in the field and provide the most efficient use of modern computing platforms. As a result, tNavigator provides superior performance and unparalleled user efficiency for reservoir engineers at the corporate reservoir simulation centers and in the field.
Bringing a new reservoir simulator to the market, we inevitably have to verify the model results by comparison with the market leaders. We also get a lot of questions about the technical description of our software and equations that the simulator solves. In this section, we present a brief review of the simulator parts and the methods applied in the main blocks.
Equations of fluid flow in porous media. Molar densities and pressure are set to the state variables that allow a general compositional model formulation, where the black oil model is a special case. The model takes into account the following aspects:
Rock Flow Dynamics
Onyx IES has collaborated with Rock Flow Dynamics (RFD) to bring their industry leading reservoir modelling software to Malaysia for the first time
tNavigator utilizes a fully implicit time scheme that allows large time steps based on approximation criteria. This approach is implemented in most of the reservoir simulators.
Finite-volume method with finite-difference approximation of the differential operators is utilized. It assumes upstream approximation. Non-neighbour connections, faults, and pinch outs are fully supported.
NON-LINEAR SYSTEM OF EQUATIONS
We use the Newton method with full Jacobian with analytic derivatives for solving the non-linear system of equations.
LINEAR SYSTEMS WITH JACOBIAN AND MATRIX OPERATIONS
We use BCGS (BiConjugate Gradient Stabilized) algorithm to solve the system of linear equations. This is a novel method that gets automatically adjusted to the problem at hand. We employ ILU(0) as a pre conditioner for the linear system solver. This method is a variation of LU-dcomposition that is designed specially for the tNavigator package. When solving a linear system with Jacobian one has to store both the sparse matrix and the pre conditioner. tNavigator contains a block-oriented modification of the widely used MSR (Modified Sparse Row) method yielding improvement both in memory volume and speed.
INTERACTIVE OPERATIONS AND DATA HANDLING IN TNAVIGATOR
In order to optimise hard disk operations during the simulation runs, tNavigator treats only state variables of the model. Since the simulation core and the visualize are in fact one application, the rest of the information can be immediately recovered by the user request. This approach allows operations with the model during the run and quick visualization with no time spent on writing and reading data from the disk.
Explore tNavigator Modules…
RFD is expanding quickly to keep up with a fast growing Oil & Gas service industry. Our multidisciplinary team has over 30 highly qualified professionals engaged in the development and support of the next generation of reservoir simulation software. Apart from software, we also provide a wide range of consulting services.
RFD develops software for the petroleum industry. It offers a wide range of advanced innovative tools for reservoir engineering implemented in tNavigator – the dynamic reservoir simulator developed by the company