METHOD FOR EXCAVATION OF A WATER-FLOODED OIL RESERVOIR Russian patent published in 2004 - IPC

FIELD: oil extracting industry.

SUBSTANCE: method includes pumping of displacing agent into force-pumping wells, extraction of product from extracting wells, creating a system for controlling layer pressure in oil and water bearing areas and adjustment of extraction. During extraction level of water cutting of extracting wells is measured. Maps of water-flooded volumes are built, with use of which sources of oil and water influx from oil and water bearing areas into each extracting well are determined. On basis of isobar maps layer pressure in oil and water bearing areas for each extracting well is determined. Then, layer pressures in these areas are compared. On basis of said comparison extracting wells are selected, for which layer pressure in water bearing area is greater than layer pressure in oil bearing area. Product extraction is increased relatively to existent extraction. In surrounding force-pumping wells pumping of displacing agent is lowered or stopped for full balance of pressure in oil and water bearing areas. According to second variant of water-flooded oil layer extraction, in extracting wells, for which layer pressure in water bearing area is greater than in oil bearing area, product extraction is lowered relatively to existent extraction.

EFFECT: higher effectiveness of extraction and lowered water cutting of extracted product due to setting of criteria for well selection for adjusting volumes of product extraction and pumping of displacement agent.

2 cl, 3 ex, 9 dwg