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Oilfield Glossary
Oilfield Glossary
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wellbore fill-up

1. n. [Well Testing]
Following a surface shut-in, the flow into a well caused by the compressibility of the fluids in the wellbore. Most of the flow occurs from compression of gas in the wellbore. The practical result is that the sandface flow rate is not zero and, therefore, not constant. This gives rise to one form of the wellbore-storage effect.
See: afterflow