Wellbore annular safety valve and method

摘要

A well system (5) includes an annular barrier (14) separating the tubing-casing annulus (24) into an upper annulus (23) and a lower annulus (25) and a barrier valve (12) coupled with the annular barrier, the barrier valve permitting one-way fluid communication from the upper annulus to the lower annulus. The annular barrier may include dual cup packers.