Inventors:
Dennis M. Read - Manvel TX
Alfred Hernandez - Pearland TX
Juan A. Campos - Houston TX
Assignee:
Schlumberger Technology Corporation - Sugar Land TX
International Classification:
E21B 3410
Abstract:
A flapper valve having a curved flapper and a seat, the flapper and seat each having complementary undulating and tapered perimeters, with sealing surfaces designed to maintain seal integrity under higher pressure, for a given outer diameter to inner diameter ratio, compared to prior art flapper valves.