Tertiary recovery operation

Claim 1

AT THE CONCULSION OF A SECONDARY RECOVERY OPERATION IN A METHOD OF PRODUCING FORMATION FLUIDS INCLUDING HYDROCARBONS FROM A SUBSTERRANEAN HYDROCARBON-BEARING FORMATION BY A DIRECT LINE DRIVE WHICH COMPRISES PENETRATING SAID FORMATION WITH A PLUTALITY OF WELLS DISPOSED IN A LINEAR PATTERN AND COMPRISING A SERIES OF A PAIR OF PRODUCTION WELLS AND AN INTERMEDIATE INJECTION WELL, INJECTING AN EXTRANEOUS FLUID INTO EACH FORMATION VIA SAID INTERMEDIATE INJECTION WELL OF SAID SERIES TO DISPLACE FORMATION FLUIDS INCLUDING HYDROCARBONS IN SAID FORMATION TOWARD SAID PRODUCTION WELLS, PRODUCING SAID FORMATION FLUIDS INCLUDING HYDROCARBONS FROM SAID FORMATION VIA SAID PRODUCTING WELLS TILL BREAKTHROUGH OF SAID EXTRANEOUS FLUID THEREAT, THEREUPON INITIATING A TERTIARY RECOVERY OPERATION BY IMPOSING A NEW SET OF FLOW GRADIENTS COMPRISING THE STEPS OF SHUTTING IN THE INTERMEDIATE INJECTION WELLS IN ALTERNATE SERIES AND CONVERTING PRODUCTION WELLS IN THE SERIES ADJACENT THERETO INTO INJECTION WELLS, AND THEREUPON INJECTING SAID EXTRANEOUS FLUID VIA THE REMAINDER OF THE INTERMEDIATE INJECTION WELLS OF SAID SERIES AND THE CONVERTED PRODUCTION WELLS OF SAID SERIES, AND PRODUCING FORMATION FLUIDS VIA THE REMAINDER OF SAID PRODUCTION WELLS.