SYSTEM OF CLUSTER WATER INJECTION TO RESERVOIR Russian patent published in 2015 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: system of cluster water injection to reservoir contains the cluster pump station, block-regulating valves, pump, line for water supply to pump, water flowline connecting pump and manifold, system of distributing water lines with branches to each injection to high, medium and low intake wells. Branches of medium intake wells are equipped with calibrated unions. The cluster pump station ensures the cyclic operation mode with periodic pressure increasing or decreasing in the supply water line. The supply water line is equipped with pressure regulator to reduce or to increase pressure at pump inlet if appropriate pressure exceeds or reduces below the pressure set-point in the supply water line. The pressure set-point is pre-selected based on the pump characteristic. Additionally the pump is equipped with the variable frequency drive. The water flowline is equipped with the pressure transmitter connected with pump VFD to maintain pre pre-selected optimal pressure by the pump in the water flowline. At that branches of the high intake wells are equipped with the appropriate flow regulators to ensure permanent volume of water injection.

EFFECT: minimisation of water overinjection to the injection wells of same intake, and exclusion of water underinjection to the injection wells of other intake upon optimisation of the power consumption for water injection in the system of cluster water injection to the reservoir, and pressure stabilisation in water lines.

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