Secondary oil recovery method

Claim 1

IN A SUBTERRANEAN OIL- AND GAS-BEARING FORMATION PENETRATED BY ROWS OF WELLS, AND THE METHOD OF RECOVERING SUBSTANTIALLY ALL OF THE OIL AND A MINOR PORTION OF THE GAS, COMPRISING THE STEPS: (A) INJECTING WATER AT THE GAS-OIL INTERFACE IN AN AMOUNT SUFFICIENT TO PREVENT THE MIGRATION OF THE GAS FROM THE GAS-BEARING PORTION OF SID FORMATION INTO THE OIL-BEARING PORTION; (B) SELECTING ALTERNATE WELLS IN ONE OF THE ROWS AS INJECTION WELLS DOWNSTREAM FROM THE POINT OF WATER INJECTION; (C) SELECTING A PLURALITY OF WELLS, IN LINE WITH, UPSTREAM FROM AND ADJACENT TO SAID INJECTION WELLS; (D) SELECTING AT LEAST, ONE WELL DOWNSTREAM FROM SAID INJECTION WELLS AS A PRODUCTION WELL; (E) PRODUCING A PORTION OF THE WATER INJECTED AT THE OIL-GAS INTERFACE FROM THE PLURALITY OF WELLS SELECTED UPSTREAM OF AND ADJACENT TO SAID INJECTION WELLS; (F) SIMULTANEOUS WITH STEP (E);