OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2012 - IPC E21B43/20 E21B43/30 

FIELD: oil and gas industry.

SUBSTANCE: according to the method the following is performed: working agent is pumped through rows of injection wells, product is extracted through rows of production wells, production wells pattern is sealed, watered production wells are changed to injection wells. Sealing is performed starting from the second row of production wells in relation to row of injection wells. During sealing branch vertical and/or horizontal bores are drilled from production wells of the second row. At that bottom holes of new bores are arranged in productive formation between first and second rows of production wells equally spaced from bottom holes of adjacent wells. If productive formation thickness is above 1.5 m, branch horizontal bore is drilled as branch bore with length of horizontal part in productive formation not less than 30 m. If productive formation thickness is below 1.5 m, branch bore is drilled with vertical part in productive formation as branch bore. As watering out advances, simultaneous separate well operation with branch bores is started. At that as watering-out advances, watered branch bores are deactivated or changed to injection, or this is performed to wells depending on priority of watering out. As watering out of the second row of production wells advances, sealing and operation of wells is performed starting from the third row analogous to activities starting from the second row. Sealing of central row of production wells is performed towards both rows of injection wells.

EFFECT: increasing oil recovery of deposit and reducing the costs of wells pattern sealing.

1 ex, 1 dwg