Method for optimum miscible flooding of reservoirs using a model to determine input profile

Claim 1

A METHOD FOR DETERMINING THE INPUT PROFILE OF A FLOOD FRONT SHAPE TO BE ESTABLISHED ADJACENT INJECTION WELL MEANS IN A FORMATION FOR THE OPTIMUM PRODUCTION OF PETROLEUM THEREFROM BY A MISCIBLE FLOODING PROCEDURE EMPLOYING THE INJECTION OF A MISCIBCLE DISPLACING FLUID INTO SAID FORMATION THROUGH INJECTION WELL MEANS FOR DISPLACEMENT OF PETROLEUM IN THE DIRECTION OF PRODUCTION WELL MEANS FROM WHICH PETROLEUM IS RECOVERED, THE STEPS COMPRISING: (A) PROVIDING A RESERVOIR MODEL HAVING FUNCTIONALLY THE SAME DARCY FLOW SYSTEM INCLUDING GEOMETRICAL SIMILARITY AND DIMENSIONLESS NUMBERS, AND THE SAME ARRANGEMENT OF WELL MEANS FOR INJECTION AND PRODUCTION PURPOSES AS THE FORMATION, (B) OPERATING THE MODEL WITH THE WELL MEANS EMPLOYED IN THE FORMATION FOR INJECTION AND PRODUCTION PURPOSES FUNCTIONALLY INTERCHANGED IN THE WELL MEANS OF THE MODEL FOR PRODUCTION AND INJECTION PURPOSES, RESPECTIVELY, AND WITH THE RATIO OF THE VISCOSITY OF THE MISCIBLE DISPLACING FLUID TO THE VISCOSITY OF DISPLACED FLUID AS FUNCTIONALLY EMPLOYED IN THE MODEL BEING THE RECIPUROCAL OF THE RATIO OF THE VISCOSITY OF THE MISCIBLE DISPLACING FLUID TO BE INJECTED INTO THE FORMATION TO THE VISCOSITY OF THE NATIVE PETROLEUM TO BE DISPLACEBALY PRODUCED THEREFROM, AND (C) OPERATING SAID MODEL UNTIL THE SHAPE OF THE FLOOD FRONT IN THE MODEL IS ESTABLISHED AT THE TIME REPRESENTATIVE OF THE MISCIBLE DISPLACING FLUID APPROACHING BREAKTHROUGH INTO THE PRODUCTION WELL MEANS.