MULTI-FORMATION OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2012 - IPC E21B43/20 

FIELD: oil and gas production.

SUBSTANCE: in the course of multi-formation oil deposit development there performed is drilling of production and injection vertical, horizontal and branched wells, pumping of displacement agent and product extraction. The main horizontal bore is drilled in the most permeable formation in heterogeneous oil object. Not less than three branches are directed towards roof, bottom of multi-formation object and horizontally. Note that the branches towards the roof and bottom are drilled at an angle not less than 50° in relation to the main bore and vertical line so that the length of branch bore was not less than 2 depths of general object before reaching object roof and bottom. The length of each branch should differ by not less than 20 metres, and the distance between the bottom-holes of the nearest branches should exceed 60 metres.

EFFECT: increase of oil extraction of multi-formation oil deposit and increase of wells production due to maximum coverage of deposit cut by draining.

1 ex, 3 dwg