Question 1. what's your water table level?
If the static water table level is too low you will spend a bit of energy pumping the water.
Question 2. can you pound a separate shallow well.
It's generally better to use "shallow" water for heat pumps since they generally have less minerals.
The key to "open" or "pump-n-dump" systems is fittings, valves, cleaners and materials.
1. don't use any cast iron parts.
only use plastic, copper, brass, bronze parts.
2. Add disconnect fittings or use Barb end pex fittings.
This will come in handy when you are using a drill pump and cleaner to flush out the unit. This cleaning should be part of your once a year maintenance.
3. Keep an eye on your total water usage since some states have limits.