secondary recovery

noun
extraction of oil or natural gas under artificially induced pressure after the natural flow has ceased.
Compare waterflood.


Origin:
1935–40

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
There are two types of units: exploratory and secondary recovery.
As reservoir pressure declines with oil production rates, additional oil can be
  recovered using secondary recovery techniques.
Some mine operators use dry recovery methods for primary ore extraction and
  then wet mining methods for secondary recovery.
Secondary recovery is then used to increase the amount of oil produced from the
  well.
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