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Oilfield Glossary
Oilfield Glossary
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gravity override

1. n. [Enhanced Oil Recovery]
A phenomenon of multiphase flow in a reservoir in which a less dense fluid flows preferentially on the top of a reservoir unit and a more dense fluid flows at the bottom. For example, in a steamflood, steam flows on the top and condensed liquid flows at the bottom of the zone. Gravity override causes sweep inhomogeneities that can be mitigated through foam flooding.