OpenSim Technologies main product is their Simulator “OpenSim”. They have developed a reservoir simulator integrating the physics of fluid flow in porous media with that of geomechanics, which could simulate the complete fracture-to-production cycle of a well in non-conventional fields (shale-oil or shale-gas).

Some of the features of the simulator are:

1. Black-oil and compositional fluid models
2. Fully and iterative flow/geomechanics coupling
3. Hydraulic fracturing simulation with flexible propagation criteria.
4. Cartesian and Corner Point grids.
5. Local Grid Refinement (LGR) and Dual Porosity models
6. Classical Well controls (BHP, VFP, and rate)
7. Well Management limits (Field and group of wells).
8. Proprietary and Eclipse style output for easy post-processing.
9. Dashboard summarizing the Ensemble results. 10.Flexible input and output controls through Python.

Some of the services provided are:

• Reservoir Simulation Studies o Uncertainty analysis o History Matching o Optimization
• Code Implementation or customization o Refactoring and customization of customer existing applications. o Decision-making workflows o Cloud computing (Migrate existing customer applications to the cloud)
• Training o Reservoir Simulation o Python for Oil&Gas applications o Geomechanics

They license the simulator either integrated or by modules.

Their final product (called opensim) is not open-source but commercial. Thanks to their Open Source strategy they can offer a much lower cost than other commercial alternatives and be more flexible with the adaptation of the simulator to customer requirements.

OpenSim developed the core of the simulator efficiently using fortran and then made "python bindings" to link the flow and gemechanics modules.

This strategy has allowed them to leverage on the python application ecosystem (machine learning, visualization, numerical computation) and at the same time to be able to bind with open-source libraries so they are not reinventing the wheel with every detail.

Some of their applications examples are:

• Stress-sensitive chalk reservoirs in the North Sea
• Geomechanics effects in unconventional wells (fracture propagation, fracture interaction as well as field stress changes due to depletion) in Lower 48
• Thermal/Geomechanics effects in oil sands reservoirs in Canada
• Can simulate the complete fracture-to-production cycle of a well in non-conventional fields (shale-oil or shale-gas).