RESERVOIR PRESSURE MAINTENANCE SYSTEM Russian patent published in 2014 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: reservoir pressure maintenance system includes pumps, water distribution devices with flow meters, flow controllers, water passages connecting water distribution devices to branch lines coming to injectors with different intake and grouped as per the water passages in compliance with an intake and water injection pressure. According to the invention the water passages with connected injectors with high or medium intake are coupled to the collector of the water distribution device through a spring-type flow controller with a calibrated inlet port at a movable element of the flow controller that closes output channels with potential maintenance of the required fluid flow. Branch lines of injectors with high intake connected with branch lines of injectors with medium intake are coupled to the same water passage and equipped additionally with the similar spring-type flow controllers with the calibrated inlet port that ensures required fluid flow for the respective well considering interaction with the flow controller installed at the respective water passage. At that the pump discharge line connecting it to the water distribution device is equipped with a pressure sensor while the pump is equipped with a variable frequency drive connected functionally to the pressure sensor.

EFFECT: potential optimisation of pressure in water passages, reduction of their rapture risk and material costs to maintain reservoir pressure.

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