METHOD OF INCREASING OIL RECOVERY FROM FORMATION Russian patent published in 2000 - IPC

FIELD: oil-and-gas producing industry. SUBSTANCE: for displacement of additional oil from low-permeable formation, process fluid is supplied by building up of additional high pressure of its injection into one of wells which exceeds maximum pressure developed by cluster pumping plant. It is achieved due to utilization of excessive energy of process fluid arising in limiting or ceasing of injection into highly permeable formations of other well. EFFECT: increased pressure and volumes of injection into low-permeable formations and reduced energy consumption for injection of process fluid. 2 dwg