Assertion: lift's disadvantage | /r/HasProperty | the on/offneed
Facets:
value: for high-pressure gas
type: PURPOSE
Source sentences:
text: The disadvantage of intermittent-flow gas lift is the "on/off" need for high-pressure gas, which presents a gas-handling problem at the surface and causes surging in the flowing bottomhole pressure that cannot be tolerated in many wells producing sand.