Fractures, Workovers Modeling


With the grid resolution geting higher some important details like artificial and natural fractures, nearwell zone effects, behind-the-casing flow can grow beyond single grid cell boundaries and require explicit description and detailed local modeling. In widely used simulators there are no tools to model the effects of geological and technical measures. So engineers have to use different tricks:

  • Setting of negative skins
  • Manual creation of high permeability “channels” near the wells via permeability multipliers
  • Local increase of absolute permeability near the wells
  • Non-physical compressibility in perforated grid blocks causing absolute permeability to grow along with the pressure growth (auto fractures at the injectors simulation)
  • Non-neighborhood connections

This combination of tools is extremely difficult to use, but they are the only possible strategies for standard hydrodynamic simulation software. Usage of these tools usually lead to distorted distribution of the remaining reserves, wrong estimation of water inrush, and low quality of the forecast models.

tNavigator was developed to bring a new approach to geological and technical measures simulation:

The results of numerous investigations show that our tools of geological and technical measures simulation provides the most realistic behavior of reservoir mathematical model and increases its predictive power.