| Fracturing/acid fracturing has become an important option for completing horizontal wells. How to create fractures and maintain the injection momentum become an issue. Optimization of the completion including the number and size of perforation is still a challenge.;A New Skin Factor (NS) model and Semianalytical Productivity (SP) model are two of majority models have been used to estimate the skin effect for different horizontal and vertical well completions. There are limitations for those models which might cannot work well with low the perforation density less than 0.5 shot per foot (SPF). However, in order to maintain the injection momentum, less perforation density is applied (<0.1 SPF) in the field. How to estimate the skin effect for a low-density perforation completion became an issue.;In this study, horizontal well is focused on, and COMSOL program is used to study flow rate distribution from reservoir to perforate horizontal well which has low perforation density. By comparing with NS model, to prove if the model can be used effective for skin factor calculation for both isotropic and anisotropic reservoir.;NS model is not effective for the perforation density less than 0.2 SPF in isotropic reservoir, whereas the result for anisotropic reservoir is hard to conclude. NS model seem to be not effective for every condition because most of them have more than 30% difference. However, according to the pattern of graphs, these can result in the future work about new model creation. |
