04367794 is referenced by 43 patents and cites 10 patents.

An acoustically operated downhole blowout preventer using a specially configured sleeve valve to inflate a resilient packer for shutting the wellbore annulus.

Title
Acoustically actuated downhole blowout preventer
Application Number
6/219631
Publication Number
4367794
Application Date
December 24, 1980
Publication Date
January 11, 1983
Inventor
Clifford W Petersen
Missouri City
TX, US
John M Bednar
Houston
TX, US
Agent
E T Wheelock
Assignee
Exxon Production Research Co
TX, US
IPC
E21B 34/16
E21B 34/06
E21B 33/127
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