Nigeria has abundant hydrocarbon reserves. This work is aimed at reviewing the production profile of an existing Well-Y in Niger-Delta and simulating the process using Petroleum Experts IPM 7.0 software (precisely MBAL) with Microsoft office excel 2007. For the case study, the pressure, PVT and production data at Niger-Delta are used. From the production history table, the reservoir pressure is continuously above the bubble point pressure, 2200 psig. The producing Gas-Oil Ratio (GOR) is estimated to be the solution GOR, 500 SCF/STB. Hence, the data is consistent with the PVT, since there is no free gas. Based on the response of the Campbell plot, the presence of an aquifer as a source of energy is very likely. Therefore Hurst-van Everdingen-Modified model is used as the aquifer model. The energy plot shows that the dominant drive mechanism is the water drive. From the decline curve analysis, it is observed that the decline curve type is hyperbolic with the smallest standard deviation of 0.0200079 STB/day and exponent of 1.24149. The results demonstrate that the approach is suitable for decline curve fitting and offers a new insight in decline curve analysis in the presence of unusual observations. This study is useful for the unconventional fields. It is deduced that the thickness of the reservoir is high enough and the point of perforation is far from the Oil-water Contact (OWC) to the extent that the water produced is negligible compare to the oil production. Hence, water encroachment is not considered for the economic limit. The economic limit is estimated to be 191.60bbl/day theoretically but in practical sense, no company in Nigeria would produce at that rate. Based on the prediction plot, it is recommended that the production should continue till at least 01/01/2015 because the reservoir pressure is still sufficiently high.