This paper describes the recovery performance of horizontal wells in mixed pattern waterfloods. It extends the present streamtube modeling techniques to horizontal wells by approximating the horizontal wellbore with a finite, distributed line source in two-dimensions. Together with the conventional (vertical well) solution, an integral expression for the stream function results. Streamlines extracted from this expression were used to implement waterflood recovery performance calculations.

Recovery performance at breakthrough and post breakthrough for mixed five-spot patterns were analyzed using horizontal wellbore lengths of 25%, 50%, 75% and 100% of well spacing. Results demonstrate that recovery at breakthrough is a decreasing function of wellbore length when the injection and production wells are different kinds (vertical, horizontal). Three mobility ratios (M = 0.3, 1.0, 10.0) were used to study how favorable and adverse mobility ratio fluids affect recovery performance of horizontal waterfloods.

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