It is often important to predict water production performance of oil wells early in, or maybe before, their production life. Some of the challenges encountered include difficulty in predicting water breakthrough time and post breakthrough performance. The case considered here is a well producing from a monocline with an edge-water aquifer. Although such problems can be computed with reservoir simulation, the objective of this work was to develop simple empirical correlations for predicting water production behavior from a monocline reservoir.
The reservoir model was described as a single well producing from the top of a monocline drainage block with water drive from an infinite-acting aquifer. During the reservoir simulation runs, water would cusp and cone into the well, increasing water production and decreasing oil production. A number of simulation runs were made, varying eleven model variables. Typical model variables include dip angle, formation thickness, production rate, etc. For each run, a modified Addington-style13 plot was made. The relationship between each model parameters and three graphical variables was used to develop the set of empirical correlations. The empirical correlations developed were integrated with some derived equations that relate important reservoir parameters and incorporated into a computer program.
The developed correlations and program can be used to carry out sensitivity analysis to evaluate various scenarios at the early planning stages when available reservoir data are limited. This gives a quick and easy method for forecasting production performance with an active edge-water drive. Furthermore, the approach developed in this work can be applied to water production problems encountered in other field/reservoir.