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Oilfield Glossary
Oilfield Glossary
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compressibility

1. n. [Formation Evaluation]
The ratio of the percent change in volume to the change in pressure applied to a fluid or rock.
2. n. [Well Testing]
The relative change in fluid volume related to a unit change in pressure. This is usually expressed as volume change per unit volume of fluid per psi of pressure change. Gas has higher compressibility than liquid (oil or water).