By utilising all of the computing power available in today’s multi-core workstations with a single license we have seen significant reductions in simulation time in a variety of models.
AGR TRACS International Ltd

tNavigator Modules

Fully Integrated Solution for Reservoir Engineers & Geoscientists

tNavigator is a software package offered as a single executable, allowing the user to build static and dynamic reservoir models, run dynamic simulations, calculate PVT properties of fluids, build surface network models, calculate lifting tables and perform extended uncertainty analysis as a part of one integrated workflow. All the parts of the workflow share a common proprietary internal data storage system, super-scalable parallel numerical engine (tested up to 10240 CPU and 35840 GPU cores with model sizes exceeding 1 billion active grid blocks), data I/O mechanism and graphical user interface.

tNavigator supports third party data input formats. The format converters are embedded into the executable and provide on-the-fly conversion of input data decks into the internal data storage system.

tNavigator licensing is enabled for local and network environments. Local licenses are provided for standalone workstations and laptops and require a USB dongle and corresponding license file. Network licenses for LAN and WAN networks are provided by a license server installed on Linux or Windows computer systems (physical or virtual). The license server requires access to a USB dongle and its license file. The license server is designed for high-load and could provide usage statistics for FlexNet® and OpenIT® monitoring systems.

Workflow Based Integration

tNavigator technology offers the following functional modules:

* PVT and VFP Designers are included in Geology Designer, Model Designer or Network Designer package and do not require separate licenses.

All of the Designer modules in tNavigator support Python based workflows. This allows users to record and replay sequences of functional steps for: input data interpretation, building static models, dynamic simulations, post-processing of results, uncertainty analysis or history matching. Workflows can also be used for connecting various modules of tNavigator, calling external user scripts and third-party software like Excel®.

For example, one could set up an arbitrary user defined workflow, which would include step-by step building of a structural model in Geology Designer followed by snapping seismic surfaces to match markers, grid generation, upscaling, SGS property interpolation and dynamic model initialisation with static and dynamic uncertainty variables. This static-to-simulation workflow can be run from the Assisted History Matching module and provide comprehensive sensitivity analysis of simulation results with respect to variations of static and dynamic parameters.

Black oil, Compositional and Thermal Compositional are full physics finite difference simulators with upstream flux approximation, molar densities, and pressure used as principal variables. All simulators use general mesh formulation and support fully unstructured grids including non-neighbourhood connections, layers with pinchouts and thin layers. Corner point and general block corners input formats for the model grid are supported. Multiple local grid refinements and grid coarsening are allowed. Support for naturally fractured reservoirs is provided via dual porosity dual permeability (DPDP) mechanisms. tNavigator supports trajectory (X, Y, Z) and grid (I, J, K) defined wells of arbitrary shapes and supports multi-lateral wells, ICDs, connection based fractures, and multisegmented wells. Simulation of BHP, THP, hierarchical group controls and control by rates is supported. At each time step, the coupling between the well and the reservoir is resolved by solving a fully implicit well equation that takes into account possible crossflow between well connections. The resulting system of non-linear equations built by Fully Implicit (FI) or Adaptive Implicit (AIM) method is resolved using Newton’s method. The simulation results can be exported to standard UNRST/UNSMRY binaries and RSM files. The simulators don’t require any other external software tools and can be used within integrated static, dynamic, and uncertainty workflows available in tNavigator. tNavigator can also adapt to existing corporate workflows by integrating with legacy third-party tools.

tNavigator main window

tNavigator GUI shown above lists all the functional modules and includes additional features such as Remote GUI, Batch Job Manager, License Manager and Manuals.