A subsurface safety valve (SSSV) is a downhole safety device installed in a well that can be closed in emergencies. An emergency may arise on or around a well from equipment failure, human error, collision with an offshore facility by a third-party vessel, fire, leaks, or sabotage.
https://www.youtube.com/watch?v=8E4ERMfzslM
Why Do We Need Subsurface Safety Valves?
https://www.drillingmanual.com/subsurface-safety-valve-sssv/
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