Can I rebore existing borewell?l

I have a borewell at Monda market,Secunderabad. It is drilled to a depth of 90 feet and is cased till 60 feet.

I need to rebore it for a depth of 300 feet depth, can it be done?

Also the height between the bore and the slab is just 8 feet, is it possible to rebore here ?

Looking forward to your for valuable feedback

Arihant

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