The choice of casing, or how to make a hole durable

When drilling water wells on the site, drillers use steel pipe with a diameter of 133 mm thickness of metal 4.5 mm.

As said drillers - is the best option for the price and durability. The seams between the pipes scald. Those. tubes were without screw connections.

Casing 133 mm chopped threaded connection (threaded cone) there is welded a threaded member. But a lot of sense in this rise in price is not. If you want to pull out once the casing (why would you want - will be lower), the rusted thread can not stand and would stop under the weight of the pipe. After threading - is the finest place on the tube. As well as the pipe is simply impossible to unscrew due to rust. Thread zakisnet is said and pipe broken off at this point.

There is a seam and seamless, weldless steel pipes. And also made of different steels.

In general, the threads on the casing made only to facilitate the work of drillers. All the disadvantages of the threaded connection described in detail in this video:

Many drillers use plastic casings. The photograph casing pipe PVC-U 200 mm * 7,0mm. Its obvious advantage - it does not rust.

decades may be in the ground (and no further observations). Question her only strength. If there are improvements of soil layers, it can break. But it can probably only occur in seismically active areas.

Those. paying 65 thousand. for its well 33 m with steel casing I have more than 48 thousand. I paid for the work. Well, a couple of thousand have gone drillers for diesel fuel. Yes, this work is not easy. But see for yourself what the margin ...

Movie about the plastic casing

If you are to drill the well, be sure to ask for a filter's factory made. Grid wound on the part of the pipe with holes. If there is not such a filter, you can pump the well for months as I have.

In my case for the filter casing was made of gravel, but it does not completely encircle the pipe with slots and is constantly walking the sand. While I have not washed well water pressure from a special machine with a pump. Gravel sank to the bottom and I'm still obstuchal pipe - that would be the stones as close as possible lay down in the filter area.

I now chose the casing is made of PVC 125 mm 7.3 mm, even smaller than the steel. And not just because of the price but also because of the longevity of the well. The pumps can be matched to any diameter.

Thread extend the longevity of steel pipes. What can happen to a steel pipe after 7-15-20 years?

No one will argue that the steel pipe ordinary steel rust 3 and eventually become here in the form:

It appears, in earth formations other than water, which results in a slow process of iron oxidation, rusting of metal is an electrochemical corrosion which accelerates oxidation of the metal.

To protect the pipeline from corrosion protection electrochemical technology exists (Cato protection). Its essence is shown in this slide:

But whatever it was used to protect the casing of wells - are not met. Maybe it makes sense to refer to specialists? Interestingly, expensive for such protection?

In no case do not use galvanized pipes. Zinc due to electrochemical processes goes into the water.

Another option to increase the longevity of the pipes. It is applied in the drilling of metal and plastic casings. Or a film as it is done, winding gas and oil pipelines.

But again, these pipes threaded joint which does not secured inside and at the junction. So the choice of the criteria of price and durability is given to me of PVC pipes. And if you show the case as they broke ground displacement, is willing to exchange views and make an article about this fact. Bad that had not studied the subject as follows ...

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My choice of the well arrangement of the circuit shown here

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Photos taken from public sources, with Yandex service. Pictures

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