Patent ID: 8967269
Filing Date: 2015-03-03
Classification: E21B,Y10T

Abstract:
1. A tubular valving system comprising: a tubular; a seat movably engaged with the tubular; a sleeve movably engaged with the seat between at least a first position, a second position and a third position; a release member in operable communication with the sleeve and the seat that maintains the sleeve relative to the seat in the first position until release thereof; a biasing member configured to urge the sleeve from the second position toward the third position; and a flapper sealingly engagable with the seat, such that pressure greater than a first threshold level against the flapper when seated causes release of the release member allowing the sleeve and the seat to attain the second position and a drop in pressure against the seated flapper below a second threshold level allows the biasing member to move the sleeve relative to the seat to the third position thereby unseating the flapper from the seat and preventing the flapper from being seatable with the seat.