Abstract
One of the most important concerns in perforation operation is to reduce the extent and severity of damage caused by perforating the reservoir formation in order to maximise production. In contrast to several experimental studies on modeling perforation, not many numerical attempts have been made for modeling this process.
In this study a Discrete Element Method (DEM) based code was used for perforation modeling. After generating the rock sample using an assembly of bonded particles, the advantages and shortcomings of the method are discussed. By pointing out the differences between real perforation conditions and modeling assumptions, a number of practical solutions for improvement of the numerical model are explained. The simulated rock sample is then perforated and model behavior was analysed. The results show that the porosity around the peroration tunnel initially decreases due to rock compaction. This is followed by an increase in porosity due to stress release. Results are in accordance with experimental studies reported by other researchers. Stress monitoring around the perforation tunnel provided the ability to analyse the stress shock generated during the perforation process.
