Thermal Reservoir Simulation
Thermal reservoir and geomechanical simulations are conducted simultaneously to predict the stress changes in the caprock during thermal recovery operations. They are necessary to ensure that the steam injected stays in the producing formation supporting production as well as to ensure safe operations. Reservoir modelling is heavily dependent on having right input in the model. This involves good data quality control, sound geological interpretation and correct model setup.
The reservoir description will typically start with a geological model. Often they are simplified to concentrate on the physical aspects of the caprock. The maximum stresses do not occur over the wells but along the “shoulder” of the steam chamber. Therefore pads must be modelled and single well pair models cannot be used. Due to long execution times, element of symmetry models are used. The most critical areas, from a caprock perspective, are selected to provide a maximum operating pressure.