Retrievable inside blowout preventer valve apparatus

Details Retrievable inside blowout preventer valve apparatus Retrievable inside blowout preventer valve apparatus

E - Fixed Constructions

21

B

166/50

E21B 33/06 (2006.01) E21B 21/10 (2006.01) E21B 23/02 (2006.01) E21B 34/08 (2006.01)

Patent

CA 1203161

ABSTRACT A retrievable inside blowout preventer valve ap- paratus for use in blocking undesired upwardly flow in the bore of a rotary drill string during well drilling op- erations is disclosed. The valve apparatus is installed and retrieved from a subsurface receiver sub connected in the drill string by movement through the bore of the drill string. When shutting off upwardly flow through the bore of the drill string, the valve apparatus auto- matically operably secures and seals itself in the re- ceiver sub. A wireline retrieving tool is used to re- lease the valve apparatus from the receiver sub and to establish a connection therebetween for retrieving the valve apparatus with the wireline.

438795

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