Waterbore design and construction is essential. At lockyer drilling this is something we stand for, and cannot stress the importance of protecting this natural resource. It comes down to bore design and construction.


The waterbore industry is regulated by various acts, standards and guidelines, many of which are based on international standards. The design, drilling, construction, maintenance and decommissioning of waterbores in Australia are guided by the Minimum construction requirements for water bores in Australia (MCRWBA), which was first published in 1997.


In Queensland it is Mandatory to work under the Water Act 2000. An Act to provide for the sustainable management of water and other resources and the establishment and operation of water authorities, and for other purposes.

Construction methods vary between Sub-Artesian and Artesian Aquifers. They can also differ depending on which type of drilling method you are using to construct the bore.


This can differ from construction by Cabletool Drilling, Rotary Drilling by either Mud Rotary (Circulating drilling fluids) or Rotary Air (by using a compressor ) Rotary Hammer with Air ( more commanly know as down hole hammer drilling) Auger Drilling and even Reverse Circulation Drilling.


The main thing to understand is whichever drill is suitable to your area or formation, does not alter the fact that your bore needs to be constructed correctly.

  

  • A poorly sealed casing annulus that allows contaminated surface water to enter the bore, or the inappropriate placement of bore openings against multiple aquifers that link aquifers of differing water quality.
  • Poor monitoring and maintenance, inadequate monitoring or routine maintenance of bore casings and associated headworks results in bore integrity failures not being detected or corrected.
  • Failed integrity of bore materials, a corroded bore casing or a failed grout seal allows cross flow of water between aquifers.
  • Poor decommissioning – decommissioning refers to work undertaken to properly shut down a bore. All failed or unwanted drill holes, bores and wells should be decommissioned properly, to restore aquifer-isolation and prevent surface water inflow, uncontrolled discharge of gas or fluids and flow between aquifers.
  • Poor design by introducing gravel packing into bores that don't need it. This encourages Iron bacteria and eventual bore flow restriction. This can be a lazy and easy simle way for a driller to quickly drill a hole. You take a chance of relying on the bore being sealed from the top outside. Failure can lead to water cross contamination, bacterial contamination and seal failure
  • Bore integrity failure is most likely to occur as a result of poor construction techniques. Therefore, good bore design, appropriate selection of construction materials and a high standard of cementing are essential to the integrity of a new bore. Existing guidelines and regulations provide frameworks to establish bore and well integrity; driller and operator compliance is essential.


Lockyer Drilling not only completes bores to the basic Minimum Construction Standard, but far exceeds the requirements. That little bit extra time and sometimes a few dollars more, ensures that your water resource is protected for years to come. We only use Pressure Pipe PVC for casing which is rated and tested. We do not use Bore Casing PVC a cheaper option. We nearly always use Class 12 PVC or greater depending on the depth.

When using Steel we do not use Seconds or non erw as standard rated pipe. Over 90% of our bores are constructed by pressure cementing the casing in the bore. This ensures a 100% seal, rather than taking the chance of trying to get a cement seal in the hole by, pouring or tremming the cement in via the outside top.


Should you have any questions regarding bore construction, design or cementing, please call at anytime.




                         Waterbores are our Business

                    Call 0407 197000 or 07 3202 1413 All Hours