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Re: What do you know about wells?
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Posted by swede-murphy [Email] (#6) [Profile/Gallery] (more from swede-murphy) on Sat, 3 Jan 2009 12:09:54 Share Post by Email
In Reply to: Re: What do you know about wells?, steve, Fri, 2 Jan 2009 23:36:38
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Way back in the day, this was how oil wells were drilled, but no one does that any more. It is slow and there is no advantage over rotary drilling. If you can find someone running a rotary rig with compressed air forcing the chips out (quite common for water wells) then you are in no danger of clogging up the system. You need porosity and permeability, and the pore space has to be filled with water. Fracture porosity is the least predictable/reliable, intergranular pore space is better. You need to drill through the water producing zone because as soon as pumping starts, there will be a drawdown of the water table, and you need to have your pump below this drawdown level. A good drilling contractor will flow test the well and give you an idea of the drawdown, the static water level, and the equilibrium pumping rate. Most wells are cased with perforated casing, allowing the water to flow into the well bore through the perforations, not just at the bottom of the hole. There are many variables, and each well is different, but as in so many things, start with the easy and cheap stuff first - check the pump, lower it a few more feet if possible, and consider a storage cistern - all of these much cheaper than drilling a new well.
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