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Hmm... Disagree - I'd say it is just - and only just - possible if:
- the sun is less than 10 degrees elevation (ie sunset/sunrise), where the limiting magnitude naked eye is -2.5;
- the object happened to be Mars or Jupiter near maximum brightness, as they can exceed -2.5. Venus can be brighter but can't be overhead so that's ruled out.
- the well was exactly at the right latitude corresponding to the declination of these +/- a degree, which suggests close to the equator;
- you were in the well at exactly the right time, ie consult an accurate ephemeris and have an accurate clock.
In conclusion therefore it's extremely unlikely though not totally impossible.
And yes Venus is visible quite easily in broad daylight if you know where to look, this is not all that difficult.
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