Patent ID: 9695666
Date: 2017-07-04
CPC Classifications: E21B

Claim:
1. A packer or plug assembly for selectively sealing against a borehole wall at a subterranean location, comprising: a mandrel; a sealing element mounted on said mandrel for selective actuation toward the borehole wall; a backup ring assembly disposed adjacent at least one of opposed ends of said sealing element, said backup ring assembly and sealing element selectively axially compressed along said mandrel by an actuation assembly straddling said at least one backup ring; said backup ring assembly further comprising a continuous ring comprising at least two diverging legs joined at a junction adjacent one end of said legs such that said legs define an empty gap therebetween which closes at said junction when said legs abut each other along their length under a force delivered by said actuation assembly with said sealing element in contact with the borehole wall.