Re: water well depth

From: Mike Fields (spam_me_not_mr.gadget2_at_comcast.net)
Date: 01/28/05 

Date: Thu, 27 Jan 2005 18:33:09 -0800

"Jim Stewart" <jstewart@jkmicro.com> wrote in message
news:VtSdnUEdpMu-vmTcRVn-jA@omsoft.com...
> jim w wrote:
> > While I agree that the OP said no "in well" sensors were allowed, I just
> > thought of another clever way to measure the column of water.
> >
> > Consider a tube running down to near the bottom of the well, with the
> > bottom of the tube open to the water. Now, slowly introduce compressed
> > air into the hose. The air will displace the water until the air starts
> > bubbling out of the bottom of the hose. The air pressure (PSI) will then
> > become constant. That terminal air pressure will correlate to the depth
> > of the water column that was forced out. No? (i.e. it easy to blow
> > bubbles in your glass of water, but harder to blow bubbles at the bottom
> > of an 800foot well)
> >
> > Sure, you'd have to make some adjustments for the "weight" of the air,
> > etc, but considering the relative densities of water and air, I suspect
> > these could be ignored.
> >
> > - jim
>
> Classic oilfield technique. Extremely precise
> measurments can be made if you use helium instead
> of air/nitrogen and if you carefully compensate
> for the temperature and density of the gas.
>
> Probably not practical for a 800 foot water well
> without the capillary tube.

Just be careful what plastic tube you use (and you would have to weight it
so
it didn't float when full of air). If it is 200 feet under the water, the
pressure
in the tube is close to 100psi (about 1/2 pound per food) -- some of your
lighter plastic tubing will pop at that kind of pressure. If my quick
calculations
are correct, a 200 foot air column 1/8 inch in dia displaces about 4 pounds
of
water so you would require a 4 or 5 pound weight on the end of the little
tube
so it would sink to the bottom with air in it (this does not take into
account the
weight of the tube, but I do know most of the plastic tubes I have played
with
will float quite well if full of air).

mikey

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