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  • water well drilling, micropiles, tie-rods, surveys, Finocchi arcangiolo cortona arezzo
  • water well drilling, micropiles, tie-rods, surveys, Finocchi arcangiolo cortona arezzo
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  • water well drilling, micropiles, tie-rods, surveys, Finocchi arcangiolo cortona arezzo
  • water well drilling, micropiles, tie-rods, surveys, Finocchi arcangiolo cortona arezzo
  • water well drilling, micropiles, tie-rods, surveys, Finocchi arcangiolo cortona arezzo

WATER WELL REHABILITATION

The productivity, efficiency and yield of a water well undergo a more or less constant decrease over time. Over the course of time the productivity, efficiency and yield of a water well undergo a more or less constant decrease due to factors ranging from fouling/scaling/corrosion of tubing, clogging of the drainage to, in extreme situations, the mechanical collapse of the well. Below we provide an overview of the different operating methods, from the more traditional to the more innovative involving the use of chemicals.

BRUSHING

A mechanical treatment used to scrub off the fouling that builds up on the inner surface of casings (blind segments and screens) as well as to prepare the tubing for any chemical and swabbing procedures. The operation is performed by means of a multi-purpose tool that can be used for swabbing, chemical dispensing and brushing purposes. The treatment is quick but unsuitable for wells with fragile and /or damaged tubing (oxidation, corrosion).

SWABBING

A mechanical treatment performed level with any thimble tubes and screen tubes; the alternate vertical action of a piston generates a bi-direction flow level with any screens. Swabbing is performed alternately with sand being removed by means of a special collection tool lowered into the well; a prerequisite is that tubing is in good condition. The piston can be fitted with a check valve enabling water to flow through as the piston drops down. Swabbing may also be associated with a chemical treatment enhancing the latter's efficiency and performance. The treatment is suitable for scale removal and unclogging purposes; it is not, however, advised for wells suffering from a lack of verticality.

HIGH-PRESSURE WASHING (JETTING TOOL)

The treatment is achieved by means of a high-pressure water jet injected by a special tool, fitted with nozzles, that is lifted and lowered up and down the shaft to scrape off any scales and deposits; the efficiency of the treatment is dependant on the pressure of the jet that can be individually adjusted to the available tubing to prevent any damage. The treatment is especially suitable to remove mineral or biological fouling (that can also be removed by means of appropriate chemicals) and is also effective to remove any bentonite panels in wells drilled through rotary drilling with direct mud circulation; the treatment is not advisable for all types of screens; it is ideal for spiral and Johnson screens but only of limited benefit for bridge and simple slotted screens.

filters filters

CHEMICAL TREATMENT

A treatment by which inorganic and bacterial fouling can be removed almost completely with the help of acid solutions enabling the chemical dissolution of fouled materials that are later removed through pumping

DEVELOPMENT WITH COMPRESSED-AIR COMPRESSOR

A very effective method to flush out the debris and silt that build up on the bottom of the borehole. The systems involves the installation of 2 pipes (one of greater diameter outlet pipe and one of smaller diameter supply pipe) into the well shaft. As air under pressure is fed through the supply pipe this flows to the bottom of the borehole stirring the bottom sediment and forming a bubble that rises back up to the surface through the outlet pipe flushing out debris and water.

VIDEO-INSPECTION

An indispensable tool to use before any maintenance work is carried out.



CORE DRILLING

An operation performed when the old tubing is to be removed from the well shaft and soil permeability is to be restored. The operation is carried out is several steps:

- the worn riser pipe is removed by means of an appropriately sized core bit;
- the well is filled with bentonite materials required to prevent the walls of the well from caving in;
- the drill casings are removed;
- the old drain, cement mortar and consolidations are removed by means of a reverse circulation tool.
- The new tubing is installed (both thimble and screen tubes) and the new drain, cement mortar and consolidations are cast in place.

Particular care should be given to the new screens; these should of the continuous slot type (Johnson screen); their slot size should be determined according to the characteristics of the aquifer and the new drain (this should be of rounded shape and mainly siliceous). After screens and drain have been appropriately inspected the segments to be isolated (through grouting or clay pellets Laviosa or Compactonit). Two steps are left now: the well is to be emptied and tested. This rehabilitation method allows pre-existing wells to be re-drilled and the well permeability to be restored; the method is not, however, cost-effective.