Repurposing dried up tube/bore wells for geothermal cooling

[sanjay jain]

Hi all,
Many homes in India have dried up  tube wells. They are use for household water supply as the city supply is often insufficient and unreliable. When a bore dries up due to the water table falling, people often drill new deeper ones, leaving the old bore unused. And now Rajasthan has banned new borings, so we can expect many more to be available soon.
Let's say someone is trying to cool their 1000 sq ft home, from 100+ degrees to 75 degrees. What is the feasibility of using, 3 inch diameter, 200 foot bore for geothermal cooling?
Can this be done with simple circulation, or would it require a heat pump? If it's possible at all.
~sanjay
 
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