The construction of a well requires in addition to the hydraulic calculation and selection of the applicable drilling technology, the calculation of the dimension and selection of the casing and screen material and other equipment.
The early advise from the expert of the supply industry can help for the good design of a productive and long-life well at reasonable cost. Cost and technical aspects have to be considered of equal importance. In daily practice the operation cost of a well are sometimes neglected, which could lead to an untimely incrustation and corrosion of the casing and screens, riser pipes and pumps and therefore to a shorter lifetime of the well.
Specially geological and / or topographical facts could be reason to construct a horizontal well in stead of the well known vertical water wells. Details for the construction of horizontal wells are available on request.
In addition to the essential design data like well diameter, depth, screen length, slot width, open area and permeability of the screen, the selection of the proper material has a high importance.
Essential criterions are:
&Mac183; Mechanical requirements (Tensile strength, collapse resistance, etc.) and
&Mac183; Chemical/bacteriological analysis of the groundwater
The availability of stainless steel, coated steel oder thermoplastics assure even in corrosive water a long lifetime of the well. With the development of Wire-wound screen technology in Germany (VENT-Screen&Mac226) it is possible to produce wire-wound screens with high mechanical properties for the installation in extreme deep wells.
