EP 0634560 A1 19950118 - Downhole safety valve.
Title (en)
Downhole safety valve.
Title (de)
Sicherheitsventil im Bohrlock.
Title (fr)
Vanne de sécurité de fond de puits.
Publication
Application
Priority
EP 93305446 A 19930712
Abstract (en)
A downhole safety valve for retrofitting to a well comprises an annular member (4) to be built into the wellhead, a closure valve (28) to be set in a tubing string (27) just below the wellhead, and a piston (15) reciprocatable in the annular member and having a depending rigid tubular stinger (26) for operating the valve. <IMAGE>
IPC 1-7
IPC 8 full level
E21B 34/02 (2006.01); E21B 34/10 (2006.01); E21B 34/14 (2006.01)
CPC (source: EP US)
E21B 34/10 (2013.01 - EP); E21B 34/14 (2013.01 - EP US); E21B 34/02 (2013.01 - EP US)
Citation (search report)
- [A] US 4161219 A 19790717 - PRINGLE RONALD E [US]
- [A] US 5165480 A 19921124 - WAGONER DANNY W [US], et al
- [A] US 4415027 A 19831115 - RUSSELL LARRY R [US]
- [A] US 4319639 A 19820316 - MOTT JAMES D
- [A] US 5203410 A 19930420 - COBB CHARLES C [US], et al
- [A] GB 2129848 A 19840523 - RUSSELL LARRY R
- [A] US 4807700 A 19890228 - WILKINS ROBERT L [US]
- [A] GB 2208301 A 19890322 - DOUBLE E INC [US]
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
DOCDB simple family (application)
EP 93305446 A 19930712; CA 2117296 A 19940526