METHOD FOR STACKED OIL POOL DEVELOPMENT WITH THE USE OF SIMULTANEOUS SEPARATE WORKING AGENT INJECTION Russian patent published in 2008 - IPC E21B43/14 

FIELD: oil production, particularly obtaining oil from a multiple-zone well with simultaneous separate working agent injection in reservoirs via injection wells.

SUBSTANCE: method involves lowering two pipe strings in production string of well so that packer is lowered below upper reservoir; seating packer and pressure-testing thereof; determining difference between total working agent flow-rate to be injected via injection wells and total rate of liquid produced through producing wells; injecting working agent in lower reservoir in amount equal to said difference; injecting remainder working agent volume in upper low-permeable reservoir; determining maximal injection pressure and working agent flow-rate, which provide working agent taking by reservoir without time-decrease of injected volume, for upper reservoir and injecting working agent with said pressure and flow-rate along with regulation of working agent flow rate in upper reservoir by choke restriction.

EFFECT: increased flooding efficiency for reservoirs having different characteristics.

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