METHOD FOR IMPROVING PERMEABILITY OF BED DURING EXTRACTION OF HIGH-VISCOSITY OIL Russian patent published in 2011 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling of vertical well, lowering and cementing of production string with further perforation, lowering of tubing and pump. Prior to sealing of annular space at interval below extraction level in production string there installed is removed blind packer, and on its head a sand bridge is installed. After that, hydraulic fracturing of formation is performed; and after that sand bridge is washed away by lowering process pipe string. Then by means of standard catching tool there removed is blind packer from production string; after that, to production string there lowered and installed between extraction level and level of hydraulic fracturing of formation is packer with through channel. Above level of hydraulic fracturing of formation there installed is additional packer with process pie string, inside which tubing is lowered till there is tight interaction with through channel of packer.

EFFECT: reduction of financial and material costs during implementation of method; improvement of permeability of near-roof part of formation.

2 cl, 2 dwg