[HarryT]

Be careful not to confuse the noun or adjective "good" with the adverb "well". "I've done good" only ever means "I've performed good deeds". If you want to say that you've done a good job, you must say "I've done well".

"Good" appears to be widely confused with "well" in spoken American English, although much less so in British English. Perhaps it's just a colloquial usage. Whatever the reason for it, although it's acceptable in dialogue, it shouldn't be used in any other circumstance.