DEVELOPMENT OF FLOODED OIL DEPOSIT Russian patent published in 2015 - IPC E21B43/16 E21B43/32 E21B33/12 

FIELD: mining.

SUBSTANCE: claimed process comprises the deposit drilling by the wells crossing the bed with water- and oil saturated zones. Oil-and-water saturated bed zones and intervals of their occurrence are analysed. Casing string is lowered and secured with further perforation of the bed in the oil saturated zone. Starting from well bottom side two sections are cut in the casing string, opposite the initial and final intervals of oil-saturated zone. Said sections are cut from the water-oil interface in equal intervals in oil- and water-saturated zones. Starting from the well bottom casing string cut sections are expanded by expansion reamer with slime catcher. Casing string cut section expansion assembly is withdrawn from the well. Then, the assembly is assembled at the well head, from bottom to top, which consists of water-and-oil-swelling packer composed by water-swelling pipe in length equal to casing string interval cut in water-saturated bed zone and oil-swelling pipe in length equal to casing string interval cut in oil-saturated zone, pipe and blind drillable packer. Said assembly is lowered into the well to set water-and-oil-swelling packer opposite the casing string cut section near the face. Blind drillable packer is fitted in casing string to withdraw the pipe string with wetting tool from the well. Then, the assembly is assembled at the well head, from bottom to top, which consists of water-and-oil-swelling packer composed by water-swelling pipe in length equal to casing string interval cut in water-saturated bed zone and oil-swelling pipe in length equal to casing string interval cut in oil-saturated zone, pipe and feed through drillable packer. Said assembly is lowered into the well to set water-and-oil-swelling packer opposite the casing string cut section. Feed through drillable packer in fitted in casing string to withdraw the pipe string with wetting tool from the well. Said water-and-oil-swelling packers are held for 14 days to isolate the cut sections of the well casing string.

EFFECT: higher quality of casing flows and water-saturated zones isolation.

4 dwg