Patent ID: 8424611
Filing Date: 2013-04-23
Classification: E21B

Abstract:
1. A downhole valve, comprising: a housing having a bore; a closure device actuatable between opened and closed conditions in the bore and having at least one flapper, the closure device in the closed condition disposed across the bore to isolate the bore in first and second directions; and an actuating sleeve axially movable in the bore between first and second positions and actuating the closure device, the actuating sleeve having: wherein the at least one movable dog in the extended condition engages a tool passing in the second direction in the bore and moves the actuating sleeve to the second position to actuate the closure device to the opened condition, and wherein the at least one movable dog, upon the actuating sleeve reaching the second position, moves to the retracted condition retracted from the bore and releases passage of the tool in the second direction through the closure device in the open condition.