SYSTEM TO BE USED IN WELL SHAFT HAVING MULTIPLE ZONES (VERSIONS), AND DEVELOPMENT METHOD OF DESCRIBED WELL SHAFT Russian patent published in 2013 - IPC E21B34/08 

FIELD: oil and gas industry.

SUBSTANCE: system to be used in a well shaft having multiple zones includes a production string located in the well shaft, many valves connected to the production string and each containing at least one hole to provide the connection between the production string and at least one of the multiple zones, the first and the second channels, a piston connected to swelling material and one of the above valves. Besides, the first channel is connected to swelling material. Formation fluid medium flows via one of multiple zones to the first and the second channels, and the piston is capable of being activated at contact of the swelling material with undesired formation fluid medium. One of the above valves is capable of being moved by means of a piston between an open position, at which at least one hole of the valve is open, and a closed position, at which at least one hole of the valve is closed, and opening and closing of one valve of multiple valves releases one of the multiple marker elements.

EFFECT: increasing the efficiency of selective influx cutout in the production string of the tubing in case of water or gas intrusion to the operating formation.

28 cl, 11 dwg