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Understanding Total Acid Number (TAN) in Crude Oil
Total Acid Number (TAN) is a measurement of the acidity in crude oil. It represents the amount of acidic constituents, mainly naphthenic acids, expressed in milligrams of potassium hydroxide (KOH) required to neutralize one gram of crude oil.
Why TAN Is Critical in Exploration and Production:
High TAN Crudes (TAN > 0.5 mg KOH/g) are considered corrosive.
Accelerates internal corrosion in well tubing, pipelines, heat exchangers, and storage tanks.
Increases scaling, leading to pressure drops and inefficient flow.
Affects emulsion stability, impacting separation efficiency.
Leads to processing problems and higher maintenance costs in refineries.
TAN is a moving target—changing with reservoir fluid composition, temperature, production stage, and formation water intrusion.
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