FIELD: oil and gas industry.
SUBSTANCE: proposed method is based on a periodic injection of a working agent to injection wells, and namely to some part of production wells at late development stage of a deposit by converting them to injection wells. According to the invention, injection of the working agent is performed at gradual pressure rise (during several months) excluding its penetration into neighbouring wells and till the value that exceeds by two times the formation pressure by the moment when production wells are converted to injection wells. After the volume of the pumped working agent becomes equal to volume of the fluid removed from the production well for the whole development period before the production wells are converted to injection wells, injection of the working agent to injection wells is stopped abruptly from the condition of closure of fractures of the deposit formations. Off-spec water formed during operation of production wells is used as a working agent.
EFFECT: increasing oil recovery of production wells on the deposit.
1 ex, 4 dwg
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