Patent ID: 7543651
Filing Date: 2009-06-09
Classification: E21B

Abstract:
1. A valve for use in a wellbore, the valve comprising: a tubular body; a flow tube having a bore therethrough, the flow tube disposed in the tubular body to form an annular area therebetween; a stationary sleeve disposed in the tubular body, wherein the stationary sleeve is coaxially arranged relative to the flow tube and wherein a portion of the flow tube is configured to move along an outer surface of the stationary sleeve; a flapper movable between an open position and a closed position in response to movement of the flow tube; a sealing system disposed between the flow tube and the stationary sleeve, the sealing system configured to substantially isolate the annular area from the bore, thereby substantially eliminating the potential of contaminants in the bore from entering into the annular area; and a second sealing system that is formed when an end of the flow tube directly lands on a shoulder of the tubular body when the flapper is in the open position.