PROCESS OF CLEARING OF FACE ZONE OF INJECTION WELLS Russian patent published in 2001 - IPC

FIELD: oil industry. SUBSTANCE: invention deals with processes of clearing of face zone of oil pool in injection wells while exploiting low penetrable pools or pools whose operational indices deteriorated due to fouling of zone near well. Process includes selection of families of low intake injection wells with low penetrable face zones of collectors and of high intake injection wells with highly penetrable face zones of collectors in one unified hydrodynamic system. When cluster pump station operates gate valves of water guides are manipulated, pauses of one-three days with shut off high intake and opened low intake wells are kept. Pressure differential is created by adjustment of discard gate valve. High intake wells are opened and depression is formed in unified hydrodynamic system. Pressure is dropped across well-heads of low intake wells and fluid flows from low penetrable collectors into highly penetrable collectors through high intake wells. Then cluster pump station returns to initial mode of operation and parameters of its operation are recorded. Value of change of parameters is used to make out conclusion on efficiency of clearing of face zone. EFFECT: process provides for restoration of intake of pools. 1 dwg