METHOD TO DEVELOP OIL FORMATION Russian patent published in 2010 - IPC E21B43/20 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil-and-gas industry and can be used in development of water-flooded pool with oil-in-water zones. Proposed method comprises drilling injection and output holes, injecting displacement agent and augmented formation products drainage via wells, filters being arranged below current position of oil-to-water contact, and oil drainage from formation near-top interval by oil production wells arranged on the structure elevated sections. In compliance with this invention, oil production wells arranged on said elevated sections are perforated in formation near-top interval and below water-to-oil contact level. Starting operating conditions comprise exploiting near-top formation sections by said wells on injecting displacement agent via wells with filter arranged below current position of water-to-oil contact. With water cone moving towards formation near-top interval, second operating condition is used comprising augmented fluid drainage from formation interval below water-to-oil contact, with simultaneous injection and augmented drainage of displacement agent via wells with filter located below current position of said water-to-oil contact. Second operating condition is used till stable oil content in oil producing wells. Then starting operating conditions is used. Said two conditions are alternated as required. In second operating condition, injection and augmented drainage wells are periodically interchanged.

EFFECT: higher efficiency, lower costs.

1 ex, 2 dwg