Wells – Above ground apparatus – Central valve or closure and lateral port
Patent
1991-12-18
1993-04-20
Britts, Ramon S.
Wells
Above ground apparatus
Central valve or closure and lateral port
166332, E21B 3303
Patent
active
052034100
ABSTRACT:
A blowout safety system particularly preferred for use in providing emergency protection when blowouts occur during snubbing operations due to unexpected surges in downhole pressure. The safety system comprises a spring biased valve assembly having a flapper adapted to seal off the upward flow of well fluids through the wellhead immediately upon expulsion of the well tubulars when a blowout occurs, and a port within the valve assembly for simultaneously diverting the upward flow of well fluids to a location remote from the well when the flapper closes.
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Otis Hydraulic Workover and Snubbing Equipment Services, Feb. 881520/6M, copyright 1989, Otis Engineering Corporation.
Cobb Charles C.
Laky Tibor
Britts Ramon S.
Otis Engineering Corporation
Tsay Frank S.
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