DEVELOPMENT METHOD FOR STACKED OIL POOL HAVING WATER-OIL ZONES AND/OR MASSIVE POOL Russian patent published in 2006 - IPC E21B43/20 

FIELD: oil production, particularly enhanced recovery methods for obtaining hydrocarbons at early and final oil production stages.

SUBSTANCE: method involves measuring oil and water recovery; injecting water to specify current development conditions and to model oil pool development. Determining minimal distance from exposed interval to oil-water contact, which prevents untimely water content increase in well product; drilling branched horizontal and/or subhorizontal wells, wherein main horizontal or subhorizontal bore is arranged over oil-water contact and spaced a distance providing waterless well operation period from it. Horizontal and/or subhorizontal and/or vertical branches are drilled in ascending manner so that the branches have the same azimuth as main horizontal/subhorizontal bore and/or are displaced from it towards productive pool or seam roof.

EFFECT: increased efficiency due to enlarged waterless well operation period.

6 ex, 2 dwg