ANNULAR BARRIER WITH EXPANSION DETECTION DEVICE Russian patent published in 2017 - IPC E21B33/127 

FIELD: mining.

SUBSTANCE: group of inventions relates to annular barriers, well system comprising plurality of annular barriers, method of annular barrier expanding. Annular barrier is made with possibility of expanding in annular space between well tubular structure and well shaft inner wall and comprises: tubular part for installation as part of well tubular structure, 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, wherein one of connection parts is a sliding connection part made with possibility to slide relative to tubular part, when expanding bushing is expanded, annular barrier cavity between tubular part and expanding bushing, hole in tubular part to supply fluid in annular barrier cavity for expansion of bushing and activated shutoff valve having open and closed positions and located in this hole, wherein annular barrier additionally comprises detector device for detecting the situation, when expanding bushing is expanded into contact position, wherein detector device is made with possibility to supply shutoff valve activation signal to switch shutoff valve from open position to closed position when detecting expanding bushing location in contact position.

EFFECT: higher reliability of annular barrier by creating regulated pressure in expanding bushing.

15 cl, 7 dwg