ISOLATION METHOD FOR BOREHOLE ANNULUS CIRCULATION OF SUPERIOR NON PERFORATED AQUIFER IN DOWNSTREAM PERFORATED OIL-BEARING LAYER Russian patent published in 2016 - IPC E21B43/32 E21B29/00 

FIELD: oil production.

SUBSTANCE: invention relates to oil production, namely to repair-insulation operations and, in particular, to isolation of borehole annulus circulation (13) from overlying non perforated bearing layer (5) into inferior perforated oil-bearing layer (9). During method implementation section of the production string above the depth of oil-bearing layer and below the depth of water-bearing layer is cut out, assembly is lifted for cutting, assembly is lowered with jet nozzle and treated cut-out section, oil-bearing layer is blocked with backfilling of perforation interval with sand, set drillable packer above cut section and below level of water-bearing layer, string cut section injection capacity is determined and formed channel connecting water-and oil-bearing layer, plugging of cut out section with use of packer on basis of acceleration, packer is drilled, sand is washed, assembly of pipes is lowered and blocking of oil-bearing layer by injection of plugging composition, pipe assembly with shank is lowered to level of working face, cemented annular space, after cement hardening perforation is repeated.

EFFECT: higher reliability of insulation, providing higher environmental safety of repair is supported by flow rate at level corresponding to level of repair.

13 cl, 8 dwg