Browsing by Author "Nnebue, N. C."

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    Modeling of Nigerian peak petroleum resources depletion using turbulent flow regime with dead time
    (U. P., 2015-07) Kamalu, C. I.; Nnebue, N. C.; Madu, I. K.; Kamen, F. L.; Effiong, E. E.; Obibuenyi, J. I.; Uzoije, A. P.
    Seven simple physical non-linear, mathematical models for petroleum resource depletion for Nigeria were developed by varying the input functions of the laplace domain of the models. The models were validated with data collected from the Department of Petroleum Resources (DPR), Ministry of Petroleum Resources, Nigeria, using MATLAB 7.9 software. As a control, these models were compared with an existing model by Hubert and found to be generally better. Two best models (III and V), with R2 of 99.696% (oil), 99.680% (gas) and R2 of 99.695% (oil), 99.641% (gas) respectively compared to Hubbert’s model with R2 of 98.67% (oil), 99.26% (gas), were selected out of seven (VII) models. The plots of the derivatives of the models which gave the annual production profile were also used to determine the peak and exhaustion periods for both oil and gas. The results were within range 2062 - 2121AD and 748982AD (infinity) respectively for oil production peak and exhaustion, and within the value 2782AD and 13853AD (infinity) respectively for gas production peak and exhaustion from 1957AD. The oil and gas ultimate recovery reserves were subsequently determined at 641.3TB and 5729Qscf respectively. Hence, even though the oil will peak before gas, gas will exhaust before oil. However, this can be due to the slight lower R2 of gas as compared to that of the oil