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Oilfield Glossary
Oilfield Glossary
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acid number

1. n. [Enhanced Oil Recovery]
A measure of the amount of acidic components present in a crude oil. This measurement is the mass of potassium hydroxide (KOH) in milligrams titrated into a one-gram sample of oil—such as stock-tank oil—that is required reach a neutral pH of 7. The test is performed under ASTM Standard D664.