Exploration & Drilling

Exploration

Different methods are used in the course of exploration of subterranean water sources, depending on the nature of the subsoil.
16 years of experience and the high accuracy of the interpretation of the measurement results are the basis for thousands of successful water projects worldwide.
With a success rate close to 100% for exploration and well construction we are sure among world’s top suppliers in this field.

Why a success rate close to 100%?

WED takes over the entire responsibility for a well project. WED plans, explores the prospect and constructs the well.
The explored data by WED are irrevocably confirmed. That means for the customer that he gets delivered in all cases, the measured amount of water.
Only then for us a project has been successfully implemented.
Our technology, our team and our experience are your guarantee for a successful project.

Methods for the exploration of subterranean water

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Preliminary hydro-geological examinations

Geological maps, drilling results and 3-dimensional models of the geological subsoil serve as base for preliminary examinations.

These evaluations are carried out by our professional team of geologists and serve as basic data for the project development.

WED has in recent years pre-explored numerous areas and has a large database of water resources worldwide. These data are considered in each project and integrated into the project development.

Geohydraulics

Geohydraulics deals with the quantitative measuring and calculation of groundwater flow- and -transport procedures.

Pump tests in drillings and wells are used to explore water resources. Accordingly, hydraulic values, such as the yield or porosity are determined in the course of this procedure.

All common borehole tests up to a depth of 5,000m are determined with the help of measuring vehicles as well as via pump tests and the examination of available soil samples.

The digital registration and data evaluation are made via the software that was especially developed by ‘WED GmbH’. The results are evaluated and recorded in the form of measuring tables.

Hydrochemistry

Hydrochemistry is used after successful drilling in order to provide the client clean water. This is an important step due to our philosophy to provide high quality water.

Hydrochemistry and water chemistry respectively describe and examine substances that are to be found in the water. Therefor, key parameters, such as temperature, pH-value, redox potential, electrical conductivity and the oxygen content are defined for the first assessment.

Moreover, water samples are analysed regarding the content of elements (cations, anions and non-loaded complexes) and organic contents. Accordingly, conclusions related to the quality and origin of the water as well as to possible contaminations can be drawn.

Apart from the micro-biological assessment with regard to bacteria and viruses, the chemical components in the solvent water are an essential criterion for the operation of waterworks as for drinking- and industrial water supply and sewage plants as well as for the use of water for irrigation purposes in agriculture, for the use for industrial purposes and also for mineral- and healing springs.

Geo- Electrical Measurements

With appropriate geological subsoil also geo-electrical measurements are used.

This measurement method is mostly used in combination with a second measurement method.

Due to the combination of these methods, our experts can nearly precisely define the depth and volume of the expected source apart from finding out about the existence of water resources in general.

Drilling

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Jetting procedures using air or water as rinsing medium

Wells in solid rock are nearly solely made in the course of down-the-hole hammer drilling procedures by using air as rinsing medium. Accordingly, a high-pressure compressor first presses air into the drill pipe, then drives the drilling hammer and finally transports the drill cuttings upwards via the annulus.

Drillings are usually made at a diameter of between 180 and 300mm. In case of deeper depths and in loose rocks wells with bigger diameters are often sunk with the help of indirect jetting procedures (watery rinsing with rinsing additives in the annulus downwards and then upwards via the drill pipe), as in this case a rinsing circulation can still be guaranteed.

The used extension (filter- and full pipes) has a diameter that is adjusted to the drill-diameter, i.e. mostly between 90 and ca. 200mm. Filter pipes are set on the level of the aquiferous layer while the annulus is filled up with quartz gravel. In order to avoid the penetration of surface water, the well is insulated with a clay seal.

A pumping test is conducted and the customer has the opportunity to have the water tested by the relevant food authority in order to see whether it has drinking water quality.