A Quantitative Analysis of the Impact of Well and Reservoir Parameters on Pseudo-Skin Due to Partial Penetration

Abstract

Abstract Pseudo-skin factor due to partial penetration (Spp) is a crucial parameter when evaluating oilwell deliverability. It creates an additional pressure drop at the near-wellbore region with inimical impact on well productivity. Conventionally, a fraction of the reservoir thickness is targeted for perforation to maximize production and reservoir drive thereby increasing Spp. This paper investigates the impact of changes to pseudo-skin’s intrinsic parameters on its behavior. A software application (SENDI 6.0) was developed to automate the calculation and sensitize on the parameters. The results were subsequently regressed and analyzed to monitor the fractional contribution and impact of each parameter. The results of the investigation revealed that in comparison to other key parameters, penetration ratio is the largest contributor to Spp, accounting for about 37% of the pseudo-skin factor.