Modeling of Fracture Propagation During Overbalanced Perforating

Abstract

Abstract We present here a model that describes the propagation of a fracture created during extreme overbalanced perforating or overbalanced surge of existing perforations. Model predictions are compared with field results. This paper shows that the wellhead pressure (WHP) decay is well predicted by our model and that this type of operation exhibits new features compared to hydrofracturing operations (high propagation speed, turbulent fracturing fluid flow, noticeable friction losses in the tubing). Finally, a sensitivity analysis defines some of the key parameters affecting the success of such operations. Impact on the fracture extension of the in-situ stress, the WHP, the volume of gas, the formation permeability and the number of fractures is investigated.