Rehabilitation of boreholes
Boreholes can become clogged up over a period of time due to iron or sulphur bacteria fouling and deposition of minerals within water bearing fractures. Well screens and filter packs can also clog and inhibit the ingress of water.
Generally after progressive deterioration, the water from the well becomes turbid which increases treatment costs, the well yields less water increasing drawdown and therefore increasing pumping costs against a higher head and eventually lead to the failure of the submersible pump. Boreholes that have been unused for a period of time may also need cleaning before being put back into use. There are various methods of rehabilitating a well depending on what is causing the problem.
The well may need scrubbing, treating with chemicals, acidizing or treating with gas injection. Bluewater Wells Ltd offers the service to rehabilitate boreholes that offer only a poor yield or to re-commission old boreholes that have been left out of service. In response to such an enquiry, Bluewater Wells Ltd service personnel visit the site to gather as much information as possible about the construction of the borehole. Specialist Geo-Vision borehole camera equipment is used to survey the borehole to assess the current status of any sludge build up, encrustation, collapse or corrosion of casings.
We will then report our findings and proposed remedy. We handle all pumping equipment removal, refurbishment and where necessary replacement and reinstallation. Disused boreholes are a potential liability to their owners. These can provide a direct link for contamination to enter the underground aquifer and should be professionally removed if no longer required.
BlueWater Wells Ltd handles the termination of defunct boreholes to the correct specifications and provides written documentation that the works have been carried out to the correct standards