Assertion: subsurface safety valve | /r/HasProperty | installed at upper wellbore
Facets:
value: to protect wellhead
type: PURPOSE
value: to protect the production tubings
type: PURPOSE
value: for emergency shutdown
type: PURPOSE
Source sentences:
text: A subsurface safety valve is essentially a shutdown valve installed at the upper wellbore for emergency shutdown to protect the production tubings and wellhead in case of overpressure.