Downhole safety system for use while servicing wells

Details Downhole safety system for use while servicing wells Downhole safety system for use while servicing wells

1983-12-14

1984-09-25

Leppink, James A.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166381, 166322, 166334, E21B 4312, E21B 3410

Patent

active

044731221

ABSTRACT:
A safety valve which prevents undesired fluid flow while conducting hydraulic workover or snubbing operations on a well. The safety valve includes three separate valve portions for blocking fluid flow. A poppet valve can be opened and closed from the well surface. Elastomeric sealing elements form a fluid barrier with the exterior of the work string. The work string itself opens and closes a flapper valve. The poppet valve allows fluid flow to bypass the elastomeric sealing elements.

REFERENCES:
patent: 2831539 (1958-04-01), En Dean et al.
patent: 3157233 (1964-11-01), Sizer et al.
patent: 3208531 (1965-09-01), Tamplen
patent: 3215203 (1965-11-01), Sizer
patent: 3216731 (1965-11-01), Dollison
patent: 3280914 (1966-10-01), Sizer et al.
patent: 3874634 (1975-04-01), Gazda
patent: 3967678 (1976-07-01), Blackwell
patent: 4134454 (1979-01-01), Taylor
patent: 4345766 (1982-08-01), Taranyi
patent: 4420043 (1983-12-01), Brooks

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