Predicting the behaviors of multilayered reservoirs to cumulative production in a commingled zone – A. J.Ilozobhie and D. I. Egu
Some reservoir parameters in a multilayered well were modeled with cumulative production as the most sensitive parameter using MBAL version 7.5, to predict comingling effects of layered reservoirs in a well in the Niger Delta, Nigeria, and the determination of individual contribution of layers to total production was also predicted. The results obtained from this modeling are based on the variation of permeability at constant parameters such as: Thickness, Porosity and Water break saturation in two different models. The first model( model 1) had the highest cumulative oil production compared to model 2 with layer 1 having 3.149e-6 mmstb, layer 2 with 4.1055e-6 mmstb, layer 3 with 3.638e-6 mmstb, layer 4 with 2.73563 e-6 mmstb and layer 5 with 3.456e-6 mmstb. However layer 2 produced the highest, with a cumulative oil production of 4.1055e-6 mmstb. . It was observed that, commingling of fluids occurred between layers four and five for model 1from about zero to 192.713 months at the same production rate of 2.8E-6 mmstb. In the second model, a slight commingling of fluid was observed that might occur between layer one and layer two for model 2 from about zero to 30.3 months at a production rate of 2.77mmstb. A rapid and inexpensive monitoring tool (sensors) should be used for applications such as production allocation in commingled reservoir streams and pipelines, multilayer hydrocarbon reservoir management, reservoir compartmentalization, and reservoir-fluid discrimination.