ANNULAR BARRIER WITH AUTOMATIC DEVICE Russian patent published in 2017 - IPC E21B33/127 E21B34/10 

FIELD: mining.

SUBSTANCE: group of inventions relates to annular barriers and borehole systems containing plurality of annular barriers. Annular barrier includes: tubular part for installation as well structure part, wherein said tubular part has lengthwise axis, expanding bushing surrounding tubular part and having outer surface, wherein each end of expanding bushing is attached to tubular part by means of connecting part, annular barrier space between tubular part and expanding bushing, hole in tubular part or in connection part to supply fluid in space for bushing expansion, and automatic device, which is located in hole and has open and closed positions. Automatic device contains housing with outlet and inlet openings, closing element and spring element made with possibility to switch automatic device into open position so, that fluid supplied in space, can flow in through inlet hole and flow out through outlet hole into space. Automatic device contains at least one sliding element to lock closing element, when locking element is in closed position, preventing closing element return to open position.

EFFECT: higher reliability of annular barrier operation.

20 cl, 7 dwg