Posted by GeneMO on January 09, 2011 at 14:50:06 from (76.4.166.249):
In Reply to: O/T Math question posted by 37 Chief on January 09, 2011 at 13:28:55:
We were having a water well drilled years ago and were nearing 440 foot deep. I remembered asking the well man how deep he could drill. He said he could drill forever, but what limited him was how much drill stem his rig could physically pull out of the ground.
Then he said something that intrigued me. He said he could fill the hole up with water and that would in effect "float" the drill stem some and he could lift more out.
I forget the figures, but I did the math and figure out how many gallons of water an 8" hole, 440 feet deep would hold. However many gallons equated to the amount of steel drill stem it would displace. Archimidies principle. "A solid object immersed in a liquid is bouyed upwards by a force equal to the weight of the amount of liquid it displaces"
I did that from memory but think it is close.
I never thought about floating drill stem out, but it would work.
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