PROCEDURE FOR DEVELOPMENT OF HIGH VISCOUS OIL DEPOSIT Russian patent published in 2011 - IPC E21B43/24 

FIELD: oil and gas production.

SUBSTANCE: procedure consists in pumping fuel and oxidant into upper part of pay, in initiation of inter-layer ignition and in withdrawal of production from lower part of pay from section of well deflected relative to main section of borehole. According to the invention a borehole is drilled in form of two-wellhead bore with a deflected section rising from the sub-face of the pay to its top; the borehole is cased. This bore casing is equipped correspondingly with an upper and lower filters at the beginning and end of the deflected section. Overflow channels are located between the filters closer to the upper filter. Annular space between the lower filter and overflow channels and between the upper filter and the overflow channels is isolated during installation of casing. Further, the casing sting is cemented from the filters to wellheads. Internal space between the lower filter and overflow channels is sealed with a packer. A pump is lowered from one wellhead from the side of the lower filter, while a process string is lowered from another wellhead; its annular space is isolated between the overflow channels and the upper filter.

EFFECT: reduced financial expenditures for implementation of procedure, increased efficiency of utilisation of pay combustion due to control over temperature of withdrawn production along whole length of horizontal section of well, expanded coverage of pay with steam chamber.

2 cl, 1 dwg