PROCEDURE FOR DEVELOPMENT OF WATER-FLOODED OIL DEPOSITS Russian patent published in 2011 - IPC E21B43/32 E21B33/134 

FIELD: oil and gas production.

SUBSTANCE: procedure consists in drilling-out with producers crossing impermeable natural inter-layers in pay-out bed, in lowering casing string with successive perforation of pay-out bed, in analysis of oil-and-water saturation and intervals of their bedding, in analysis of dimension of impermeable natural interlayer and in making barriers out of insulating composition separating water-saturated zones of bed from oil-saturated zones. By results of analysis there is determined thickness of the oil-saturated zone of the bed. If thickness of oil-saturated zone of the bed exceeds 4 metres, part of the casing string is cut out in the interval above lower perforation orifices of the oil-saturated zone of the bed up to a bottomhole of the well. Borehole is enlarged in this interval and is filled with isolating composition corresponding to cement grout. When thickness of the oil-saturated zone of the bed is below 4 metres, then a part of casing string is cut out from the roof of the impermeable natural interlayer to the bottomhole of the well. The borehole of the well is enlarged in this interval and is filled with isolating composition. There is formed a packer by introduction into the bottomhole zone of the oil-saturated zone of the well bed.

EFFECT: upgraded reliability and efficiency of oil deposits development by increased strength of isolation of water-saturated zone of bed.

2 cl, 4 dwg