You're reviewing corrosion inhibitor selection during matrix acidizing and you type into Google: "NACE MR0175 acid stimulation corrosion inhibitor requirements". The well is sour, L80 casing, 110°C BHST. The vendor says their inhibitor is field-proven but can't show sour-service qualification. What actually drives the NACE requirement here?

Question

Accepted Answer

Option A is the usual trap — people think time-at-risk is the driver. During acidizing, hydrogen charging is intense and fast, and sulfide stress cracking doesn't need weeks to get started. Option C sounds technical but mixes up chloride-driven mechanisms with sour cracking; wrong failure mode. Option D ignores that NACE is about exposure conditions at any time, not just steady production. The real issue is the short, aggressive hydrogen exposure that can wreck L80 if the inhibitor chemistry isn't qualified.

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