0427422-A2 is referenced by 23 patents and cites 6 patents.

A casing valve for use in a well comprises an outer housing (50) having a longitudinal passageway (52) defined therethrough and having a housing wall (54) with a housing communication port (56) defined through said housing wall, said housing including a first disintegratable plug (96) initially blocking said housing communication port; ; and a sliding sleeve (66) slidably disposed in said longitudinal passageway, said sleeve having a longitudinal sleeve bore (90) defined therethrough and having a sleeve wall (92) with a sleeve communication port (94) defined through said sleeve wall, said sleeve including a second disintegratable plug (98) initially blocking said sleeve communication port, said sleeve being selectively movable relative to said housing between a first position wherein said housing communication port and said sleeve communication port are out of registry with each other and a second position wherein said ports are in registry with each other.

Title
Casing valve.
Application Number
EP19900311621 19901023
Publication Number
0427422 (A2)
Application Date
October 23, 1990
Publication Date
May 15, 1991
Inventor
Sullaway Bob L
US
Szarka David D
US
Brandell John T
US
Assignee
Halliburton Co
US
IPC
E21B 43/11
E21B 34/14
E21B 34/06
E21B 33/14
E21B 43/11
E21B 34/00
E21B 33/13
E21B 23/00
E21B 43/11
E21B 34/14
E21B 34/06
E21B 33/14
E21B 23/00
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