Waterflood performance at constant-injection or other preset rates may be quickly evaluated by a new procedure. The method makes use of the calculations from the higgins-leighton constant-pressure evaluation. And performance data so determined provide the basic information for an economic evaluation. The effects of relative permeability--which appreciably influences recovery oil--are accounted for. Also, the method includes the use of layers to determine the effect of vertical-permeability variations. From this and other information made available by the new method, the constant- rate injection pumps can be designed. The predicted performance at constant pressure can be used to obtain predicted performance history at constant-injection rate, during the entire life of the flood. Performances can also be predicted for stagewise changes in injection rates, or even for continuously changing rates.
Issue of Publication
Oil and Gas J., V. 69, No. 10, Mar. 8, 1971, PP. 68-72
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