Patent ID: 9181779
Filing Date: 2015-11-10
Classification: E21B

Abstract:
1. A reverse-out valve, comprising: a first mandrel; a second mandrel movable with respect to the first mandrel; a collet arranged about the first mandrel and having a cover portion and a plurality of fingers that extend axially from the cover portion, wherein each finger provides a collet protrusion defined thereon; a plurality of dogs movably arranged within a corresponding plurality of windows defined in the first mandrel; a reverse activated plug device movable between an open position, where the plurality of dogs are disposed within a groove defined in the second mandrel and a reverse-circulation fluid is able to bypass the reverse activated plug device, and a closed position, where the plurality of dogs are moved out of the groove and the reverse-circulation fluid is prevented from bypassing the reverse activated plug device; and a biasing device arranged between the collet and a lower shoulder of the first mandrel, wherein, when the reverse activated plug device is in the open position, the biasing device urges the collet against an upper shoulder of the first mandrel and covers the corresponding plurality of windows with the cover portion and thereby maintains the plurality of dogs within the groove.