DEVICE FOR DEVELOPING A MULTIPLE-ZONE WELL Russian patent published in 2018 - IPC E21B34/06 E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry and can be implemented at operation of multiple-zone wells both for separate and simultaneous production of beds. Device contains a nozzle with holes arranged opposite to each of producing beds pressure tight separated from one another with packers, located inside the nozzle, connected to the pumping equipment and a fitting plugged from the bottom, which is equipped with side openings opposite the openings of the nozzle. Openings of the nozzle are equipped with controlled spring-loaded valves, including a hollow cup, inside which there is a sleeve with a seat, and a ball that is capable of leak-tightly interacting with the seat of the sleeve, excluding the flow of products back into the bed. From above, the fitting is equipped with an additional spring-loaded valve that transmits pressure from the annulus to the inside of the fitting at a pressure greater than the hydrostatic pressure between the mouth and the inlet of the additional valve. Adjustable valve is installed inside the nozzle. Sleeve is provided from the inside with a cylindrical hollow insert, it is inserted into the hollow cup with the possibility of limited radial movement and is spring-loaded in the direction of the fitting. Hollow insert is configured to leak-tightly enter the corresponding side opening of the fitting when it is aligned during the rotation of the fitting with the pumping equipment lowered on the pipes.

EFFECT: technical result consists in simplifying the maintenance and saving the well maintenance time by completely eliminating downhole operations and eliminating the use of complex equipment.

1 cl, 2 dwg