Simulation Model Building
To get the maximum out of a flow simulator, a high-quality model is needed as input. RMS™ Simulation Model Building offers a user-friendly platform for building, maintaining, and post-processing simulation models. The integrated environment promotes close cooperation between geoscientists and engineers.
|Simulation model displayed with oil water contact and wells with pie charts
3D grid building in RMS is easily performed based on the structural model. The building process is fully automatic, and the grid can be easily regenerated to fit new information as it becomes available. Complex geometries associated with normal or reverse faults can be handled in the same manner as simple geometries. A large toolkit is available for creating local grids and for manipulating the grid.
The flow grid can be populated with petrophysical properties using RMS’s unrivalled collection of upscaling methods. RMS offers a suite of cell-based upscaling techniques, both static and flow-based. Novel transmissibility upscaling is available to give maximum accuracy for representation of heterogeneities in the flow model.
Well trajectories, completion data, and the grid model can be combined as input to generate well data for flow simulation. Dynamic well modeling in RMS also includes the preparation and maintenance of production data. Export functionality is available to transfer the model to industry standard flow simulators.
Simulation Model Building Features
• Build 3D simulation grids consistent with the structural framework
• Handle simple and complex geometries with the same ease of use
• Choose optimum gridding solution for fault representation and zone handling
• Edit grid geometry in 3D
• Represent heterogeneities through industry-leading upscaling techniques
• Create well data for flow simulation
• Quality control your simulation model through a rich suite of tools
• Exchange data with external flow simulators in a user-friendly way
Simulation Grid Design
|Top left: Complex grid. Top right: Different layering options. Bottom left: Grid with air interpretation. Bottom right: Reversed staircase fault.
3D grids can be constructed with any desired grid control and with full user control over important parameters. Grid regularization can be used to achieve close to orthogonal cells, ideal for flow simulations. Within each zone, advanced layering options are available for accurate representation of reservoir features. Complex geometries associated with normal and reverse faults are easily handled, using pillar or staircase representation.
Control lines can be used to ensure that the grid reflects important model features, such as reservoir boundaries, major faults, or well geometries. Non-uniform grids with an optimal grid resolution are also easily achieved through use of control lines.
Local Grid Refinements
Local grid refinements may be required in well regions to increase accuracy. Simulation Model Building in RMS offers an extensive toolkit for generating local grids, where they can be defined interactively or automatically from well and parameter data.
Grid segments may be used to define regions in the 3D grid, for instance as a fault block in the reservoir. Modeling and analysis of the individual regions can then be easily performed, with the amount of data compared to the total model being reduced. Results for a selected set of grid segments can be exported to the flow model, making the generation of sector models an easy task.
Upscaling Grid Properties
|Cell-based versus half-cell transmissibility upscaling
Upscaling algorithms in RMS Simulation Model Building offers a rigorous approach to handle the complex cell geometries associated with corner-point grids. Direct sampling offers a fast and robust method for identifying the cells in the geogrid contributing to each flow simulation cell, minimizing an important general source of error in upscaling. Tools describing the result of the sampling process are available, allowing for detailed quality control.
Simulation Model Building in RMS offers a complete suite of upscaling techniques, including static and flow-based methods. For flow-based methods, alternative boundary conditions are offered, and a skin or buffer region can be used to reduce artefacts of the selected boundary conditions. Novel transmissibility upscaling methods can be used to achieve an accurate representation of heterogeneities in the flow model.
Well Data for Flow Simulation
Based on well trajectories, data for perforation intervals, and the 3D grid, RMS Simulation Model Building allows you to construct well data for flow simulations. Also, zone log data can be used as input, to ensure that perforations will be located in the correct zones in the 3D grid. Production data can be created and maintained inside RMS. Imported historical production data can be used to prepare well constraints describing the dynamic conditions for a well or well group.
|Multilateral well displayed with segment model data
Export to Flow Simulators
Export of simulation models to leading flow simulators is easy and user-friendly. Exported data can be renamed to fit requirements in the simulator of choice. Data for local grids can be exported together with the global grid or separately.
The reservoir modelling process is not complete until the impact of heterogeneities on fluid dynamics is fully understood and the predicted results match production history. Simulation Model Building supports import of simulation results from commercial simulators for further analysis and visualization inside RMS. A rich toolkit for data analysis and for conversion between data types makes RMS the ideal platform for combined analysis of production data, geological data, and seismic data.