Model Designer: The Second Step in Improving Your Reservoir Simulation Results

tNavigator Model Designer

You have a big oil and gas reservoir to simulate, either for new field development or for making operational and investment decisions on an existing field.

You have your static geological model at hand; to create it, you likely used one of these reservoir simulation software programs:

  1. The wildly expensive, overwhelmingly difficult, more-complex-than-it-needs-to-be program; or
  2. The newest, user-friendly, Geology Designer program, part of the integrated reservoir simulation suite of programs called tNavigator.

On to the next step in your reservoir simulation – modeling the flow of fluids and gases inside the reservoir to determine its production potential.

Building your dynamic reservoir flow model

You need to have your simulation model predict the two aspects of fluid dynamics:

  1. The pressure profile along the flow path;
  2. The rate-versus-pressure relationship along the path.

To build your reservoir flow model, you can use the more-complex-than-it-needs-to-be program and invest more time and money than you need to, or you can use the tNavigator Model Designer module, a simulation pre-processor that helps you create a dynamic flow model and then edit, update and maintain the model on-the-fly as needed.

Because of its simplicity, extensiveness, affordable cost and speed, we’ll focus on how to build a reservoir flow model using Model Designer.

First, let’s give the preprocessor its information. Start by using a static model built with tNavigator’s Geology Designer module, or by loading RESCUE files containing grid, porosity, property and well trajectories, or using an existing E100/E300 model. Next, build the relative permeabilities (Corey and LET-type correlations), and apply PVT (press-volume-temperature) data and VFP tables of how fluids behave in wells.

To build the simulation model, load any well history and events, and set up the schedule section to set limits and control modes for wells, along with economic limits. Then create well groups and controls (no limit on the number of wells, by the way). In just a single Model Designer project you can create a field development strategy that includes planning, restart and forecast scenarios, and how to handle multiple simulation cases.

While Model Designer is a GUI preprocessor, it has lots of post-processing elements built into it so you can do a wealth of graphic analysis, 2D and 3D visualizations, histograms, crossplots, and Python-based workflows.

“Here’s the set of software tools simulation engineers and geophysicists have long dreamed of for simulating reservoir and well behavior: Model Designer and the entire tNavigator suite.”
— Tom Thrasher, Reservoir Engineering Consultant/Advisor, Western Gas, Australia

Modeling unconventional reservoirs is as easy as pie

You can design and simulate multi-stage hydraulic fracture configurations with virtually unlimited complexity with Model Designer. Fractures with arbitrary geometry can be modeled with no restrictions on the number of fracture stages and fracture clusters, nor on the angles of fracture-to-fracture, fracture-to-well, fracture-to-grid relative orientations. Fractures can intersect too!

The various rock properties (porosity, permeability, net-to-gross ratio) and reservoir regions (saturation, rock compaction, PVT) can be initialized and changed over time, and fractures and SRV zones can be defined using templates and user-defined parameters.

You can merge or split multiple fractures from each other. Built into Model Designer are new types of adaptive logarithmic LGRs (local grid refinements) that ensure effective unstructured gridding around fracture paths. Inputting fracture properties for multiple wells into the Fracture Table enables handling large data arrays, and incorporating frac propagation results from third-party software such as GOHFER® and StimPlan™ are no problem. Options for dual porosity/dual permeability, coal bed methane and others are available, and it’s simple to assess a fracture parameter’s impact on production.

Model Designer is one of the eight software modules built into tNavigator. The other seven are:

tNavigator runs on Linux, Unix, Windows (64-bit) OS computers, laptops and workstations, or can be installed on a high-performance computing (HPC) cluster. Or you can run them from the cloud.

All eight tNavigator modules were written by the same programming team using C++ programming language and the CUDA graphic processing unit (GPU) application development interface (API). The software’s parallel technology unlocks the full potential of modern computing systems and takes full advantage of multicore CPU and GPU processing power.

tNavigator unleashes the power of latest computing technologies such as NUMA (non-uniform memory access) clusters that improve performance and expansion, hyperthreading (microprocessor technology that boosts parallelization), and hybrid MPI/SMP multiprocessing applications. That’s why tNavigator reservoir simulations far exceed the performance of any other industry-standard dynamic simulations.

“I am really impressed with tNavigator’s accuracy of results and the speed of calculations. My last project was a complex oil field to history match, with several producers as well as gas and water injectors. Using another simulator, the run-time was 36 hours with a single core and one hour with 20 parallel cores. But with tNavigator, the run time was reduced to 30 minutes, and the results were rigorously identical”.
– Nolwenn Perzo, Staff Reservoir Engineer, Oilfield Production Consultants, London

It’s time to learn more, and try tNavigator yourself! Request a Demo or visit the Contact Us page and call one of our 20 offices located throughout North America, South America, Europe, the Middle East, Africa, Russia, China, Southeast Asia and Australasia.