CPC E21B 33/12 (2013.01) [E21B 34/063 (2013.01); E21B 43/14 (2013.01)] | 5 Claims |
1. A well barrier for use in a subterranean well, the well barrier comprising:
an inner mandrel;
a flow passage extending longitudinally through the inner mandrel; and
a plug releasably secured relative to the inner mandrel, the plug blocking fluid flow through the flow passage, and the plug including a shoulder that prevents the plug from displacing completely through the inner mandrel in a first longitudinal direction, in which the plug is configured to release and displace out of the inner mandrel in response to application of a first positive pressure differential in the first longitudinal direction and in response to application of a second positive pressure differential in a second longitudinal direction opposite to the first longitudinal direction.
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