SYSTEM OF SOLID LOW-PRODUCTIVE ZONARY-HETEROGENEOUS OIL FORMATION DEVELOPMENT Russian patent published in 2012 - IPC E21B43/14 E21B43/20 E21B43/30 

FIELD: oil and gas production.

SUBSTANCE: development system includes productive multi-hole ring holes with main vertical bore and side bores the horizontal areas of which in productive formation are directed symmetrically in radial directions in relation to the main bore, and vertical injection wells located by even square five-spot pattern of water flooding. According to the invention in the centre of the square there is a ring productive well, and in the four corners of the square - vertical injection wells. The distance between neighbouring productive wells is taken larger than the average size of the zone of permeability chaotic changing. The horizontal areas of side bores of adjacent ring holes are symmetrically turned relatively one another.

EFFECT: increase of production rate of zonary-heterogeneous formations regarding permeability, reduction of drill works and well operation cost.

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