METHOD OF DRILLING-IN Russian patent published in 2010 - IPC E21B7/06 E21B43/14 

FIELD: mining.

SUBSTANCE: during production of reserves in two shafts no sudden inrush of water from water-bearing stratum occurs upon considerable pressure drawdown on productive stratum. This is achieved by the following: upper conventional-level section is made in upper bank with open hole. Primary conventional-level shaft, in which shank end is descended, is run through clay brattice and system of dense rock in lower part of reservoir rock of the same stratum. Shafts may be separated in azimuth 40-45° among themselves for the purpose of larger coverage of stratum. Thus presented engineering solution allows to use this method for deposit occurrence of liquid hydrocarbons in order to increase productivity of horizontal holes in reservoir rocks of high capacity (up to 35 m) or in strata separated by brattice (baffle) of dense (clay) rock, to aggregate slightly drained zones of stratum, to enlarge coverage of deposit working in area, to reduce construction expenses, to reduce term of construction of downhole splitters, to increase deposit oil recovery factor.

EFFECT: invention allows to aggregate undrained zones of stratum, to increase hole productivity, to enlarge area of deposit draining, to reduce term of construction of hole, to minimise expenses and to increase deposit oil recovery factor.

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