Reservoir Performance Assessment of Well D4 from Niger Delta Using Kappa Saphir Software

Abstract Reservoir formation damage caused by skin is one of the critical factors impairing permeability and reducing well productivity. Pressure Transient Analysis (PTA) is a key diagnostic tool used to assess well performance, identify formation damage, and guide production optimization strategies. In December 2023, NNPC E&P (NEPL) reported a drastic decline in production from Well D4 in the Niger Delta, with subsequent well interventions and Bottomhole Pressure (BHP) surveys failing to fully diagnose the issue. This study employs Kappa Saphir Software to perform a comprehensive reservoir performance assessment of Well D4. The analysis estimated key parameters, including an initial reservoir pressure of 2358.09 psia, permeability of 8.68 mD, and formation flow potential (kh) of 676.99 mD-ft. A wellbore storage coefficient of 6.40E-4 bbl/psi was estimated, indicating minimal wellbore effects, while a positive skin factor of 7.97 confirmed significant formation damage as a primary cause of production decline. Additionally, the reservoir was found to be homogeneous with an infinite boundary model. These findings provide quantitative insights into the well’s performance, enabling targeted strategies for mitigating formation damage and enhancing reservoir productivity. Based on the results, well stimulation techniques such as matrix acidizing are recommended to restore permeability and improve production efficiency.