METHOD OF INJECTION OF WATER IN THE SYSTEM OF SUPPORTING THE RESERVOIR PRESSURE IN WEAKLY PERMEABLE HEADERS Russian patent published in 2019 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry, in particular to the method of pumping water into the reservoir to displace oil and maintain reservoir pressure when pumping or increasing the discharge pressure of waste water, which is supplied from the mouth, using the electrical submersible pump (ESP) unit of inverted type. Method comprises the forced injection of water into the well. Water is supplied from the pumping station through a high-pressure pipeline. Water is pumped through the wellhead valves into the annular space of the tubing and completion string. Water is taken from the annular space by means of the ESP of inverted type. ESP is set in close proximity to the wellhead. Protection of the completion string against high discharge pressure is provided by means of the anchor and the lower packer. Lower packer is installed directly above the perforation zone of the productive formation. Protection of the production string against the dynamic effects of the injected water is carried out by the top packer. Top packer is installed under the electric centrifugal pump through a mechanical landing tool. Tight connection of the top packer with electric centrifugal pump is ensured. Control of the pressure and volume of water injection into the reservoir and the water withdrawn from the annular space is carried out by means of immersion telemetry. Change in pressure and flow rate of injection is carried out by changing the frequency of ESP rotation.

EFFECT: technical result is to increase the efficiency of the development of low-permeable reservoirs by providing a high pressure of the injected water at the bottom of the well.

1 cl, 1 dwg