This work investigate the effect of completion parameters -well inflow performance relationship, production performance assessment, perforation shot density, perforation diameter, and gravel pack permeability -on gravel-packed oil well using PROSPER. Sensitivity analyses was performed for different perforation shot density, perforation diameter, and gravel pack permeability on oil production rate. Results show that without gravel pack completion, as bottom hole pressure decreases, liquid production rate increase due to increased pressure drawdown giving rise to oil production rate of 15719.7 STB/day. For well production performance, the well produced 10907STB/day of oil at a flowing bottomhole pressure of 2557.22psig without gravel pack and with gravel pack, it produced 8427.13 STB/day at 2330.38psig. Gravel pack installation resulted in a sand control skin of 3.78383 signifying a pressure drop of 905.144psig. For gravel pack permeability of 25000mD, 30000mD, 35000mD, 40000mD and 45000mD, the model predicted an oil production of 8056.05 STB/day, 8260.34 STB/day, 8427.13 STB/day, 8566.95 STB/day and 8686.55 STB/day. Increase in the gravel pack permeability increase the oil production rate. Increase in the perforation diameter increases the oil production rate. Similarly, perforation shot density of 2-in, 4-in, 6-in, 8-in and 10-in, resulted in an oil production rate of 3508.77 STB/day, 5894.14 STB/day, 7439.85, 8427.13 STB/day, and 9066.2 STB/day respectively. The study concludes that gravel pack completion can impact well performance and recommends optimizing completion parameters to enhance production while controlling sand production.