Start with these: http://howtodrillawell.com/ and although it isn't listed on their site, these folks have a book and DVD about building a $400 drill rig that will drill hundreds of feet. The guy's name is Loy Robison. http://www.lostcreek.net/home.html Thanks, Farm Show!
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Is there a drill with 8 feet and more bit length earthing , that can drill through hard rocky surfaces
water well drilling can be difficult but you do save a lot of money if you can figure it out.
It sounds like you are wanting this well for drinking water with the need to drill that far down you would want to have it done with a rig. For yar irrigation here is a much easier method that I will be using soon for mine. http://www.drillyourownwell.com
That's a very big hole. Why does it need to be so wide ? As the others have said, this takes a drilling rig. You have to provide a lot of torque to do this, and you also need to use a drilling mud to pump up the breaking rock. Of course, in pure sand, with enough water, you could blow water down the core of the drill, and blast the sand back up the pipe.
Back in 1960 my father had a 120 ft x 6 in well pounded in with a truck mounted cable tool well drilling rig in less than a week. That is not a large bore well.
The HydraDrill has been around for years and could be made from an old lawn mower engine and some pulleys. It can drill 100' through rock. You'll need to have water available for slurry to lube the drill. It will only plant a 2" casing though, but that is all you should need for a home well. You would use a larger tank to establish more reserve if you really needed it.
6 inch home water well? That is really large. Dying to know why it needs to be that big. Drilling 100 ft X 6 inches takes so much power and drilling skill you probably need professional help. Boring gets exponentially harder the deeper you go.
You get a drill rig. Sorry, I don't know of any homebrew solution; you might be able to rent equipment if you already know how to use it, but more likely you'll have to hire a pro.
+1 At a guess, this need for width is for a vertical shaft geothermal loop?
I only know of 2 ways to accomplish this. One method they use in 3rd world countries is to use a length of heavy metal pipe a few inches in diameter, with one end tied to a rope. the pipe is a few feet long... enough length to make the pipe light enough to pick up and heavy enough that when dropped, it diggs into the dirt. They just keep dropping the pipe down the hole and lift it up by rope. your friend who is there to take the mud out each time you lift the pipe out of the hole. The bottom end of the pipe is probably sharpened to help it dig in. The 2nd way is a method i have used to go down 20 feet, and it could go deeper with some modifications. I was told this method by an old man who used to dig wells about 30 feet deep... he just got an AUGER type post hole digger. It has a tee handle at the top that you just twist by hand. In about 5 hours of work, you can go down about 15 feet. When you start out, the drill is only about 4 feet long. as the drill goes down, you must add on little 3 foot lengths of gas-pipe If you want to go down 100' deep, then you will need to remove pieces of pipe as you lift it up each time... then clean off the dirt... place the drill back down the hole while re-attaching 3 foot lengths of pipe. It is more time-intensive than labor intensive.. Me and my brother dug down about 20 feet in a few hours, and didnt really work up a sweat. Where I live, there are not many rocks underground. just dirt. if you hit rocks or something similar, then this method would fail. using this method, be sure to ONLY turn the drill CLOCKWISE or else sections of pipe will UNSCREW. It takes about 5 to 8 turns of the tee-handle to fill the auger with dirt. When digging a hole like this, be sure to securely plug the hole if you dont finish digging. then pile boulders on top of it. you dont want rodents or pets or children to fall into it.