Abstract
Abstract In predicting the performance of a pattern injection operation, the engineer needs to know both the amount of oil to be recovered and the rate at which the recovery will take place. This paper describes fluid flow model studies on the effect of mobility ratio on the rate of oil recovery in a five-spot. The results show the change in fluid conductivity (total flow rate/ pressure drop) as the sweep-out pattern increases for mobility ratios between 0.1 and 10. These data, when combined with a knowledge of reservoir permeabilities and sweepout pattern efficiencies, can be used to predict the cumulative oil production as a function of time for homogeneous five-spot injection systems. Introduction The flow potential in a pattern flood element is a function of the mobility ratio and how far the injected flood front has gone. For a waterflood project having a mobility ratio of one, the conductance - which is the flow rate per unit pressure drop (q/ ?p) - will remain the same throughout the life of the flood. If the mobility ratio is favorable < 1), the conductance of the project will drop continuously throughout the operation. If, on the other hand, the mobility ratio is unfavorable, the conductance ratio will increase continuously. Therefore, if the reservoir engineer wishes to predict either the rate at a specified pressure or the pressure at some rate for a secondary recovery project, he must know how the conductance will vary during the flood. Other investigators have studied this problem using potentiometric models or analytical solution. The method described in this paper uses fluid flow models to study the variation in conductance with mobility ratio and flood front advance. Fluid flow models are more directly analogous to the reservoir and the resulting data can be directly applied to secondary recovery projects. This method was developed to yield reservoir engineering data which can be applied directly from graphs to the reservoir problem.
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