OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2015 - IPC E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: at an oil deposit development oil is extracted through production wells and water is injected through injection wells in a cyclic mode. The cyclic mode is performed at individual injection wells fed with water from a group pumping station. At the remaining injection wells the permanent injection pressure is maintained. In the cyclic mode periodical limitation of water injection is set for the individual injection wells by complete or partial cut-off of a headrace with respective limitation of the injected water. Pumps of the group pumping station are set to the mode of the permanent pressure maintenance at the station output. An electric drive of the pumps is made partially regulated. At that a non-linear reversed algorithm is used for frequency regulation of the pumps electric current depending on the pressure at the output of the group pumping station. When the consumption rate of a working agent is reduced and the pressure is increased in the pump flow line the frequency of the electric pump feeding current is reduced as per a non-linear dependence till the preset pressure is obtained at a flow line of the group pumping station. When the consumption rate of the working agent is increased and the pressure is decreased in the pump flow line the frequency of the electric pump feeding current is increased till the preset pressure is obtained at the flow line of the group pumping station. The duration of the headrace cut-off is defined as the time required for the stoppage of the fluid flows movement in in-situ conditions within limits of the injection well impact. The duration of the complete or partial cut-off of the headrace is an assigned period of at least 2 hours and less than 4 hours per day. The complete or partial cut-off of the headrace is assigned with consideration of the time for control of the electric network power.

EFFECT: improved efficiency of the method due to the ensured optimal mode of water injection at water flooding and reduction of costs for oil production.

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