DEVICE FOR SELECTIVE DEVELOPMENT AND PROCESSING OF MULTIPAY WELL OR BED CONSISTING OF ZONES WITH DIFFERENT PERMEABILITY Russian patent published in 2015 - IPC E21B43/14 

FIELD: mining.

SUBSTANCE: device contains branch pipes with holes located opposite to each of the productive beds or zones with different permeability which are tightly separated from each other by packers. Each group of holes is fitted with valves with seats spring-loaded from below that are fitted with sealing rings along the external surface. The device contains a guiding pin which is rigidly fixed and designed with a possibility of interaction and movement under the effect of difference of pressure along the closed groove made outside of the seat designed as alternating short and long grooves for closing and opening of holes of the branch pipe. The seat is inserted into the respective branch pipe with pin and designed as two bushings connected by a sleeve with sealing rings, the upper one of which is designed with a bigger outer diameter, and the lower one is fitted with one or several lateral holes located between sealing rings and designed with a possibility of interconnection with holes at pin arrangement in short or long cavity of the groove which is made on external surface of the hollow barrel placed outside of the sleeve with a possibility of rotation, and the spring is installed outside of the barrel between bosses, the lower one of which is fixed with reference to the branch pipe, and the top one - with reference to the valve seat.

EFFECT: improvement of reliability of the device design.

2 dwg