Our drilling rigs have two truck arrangements, one for rig unit and second to carry the compressor. We also have a drill rig on a 5tonne truck which enables us to access and drill on small spaces which are not accessible to most drilling rigs.
The rig has capacity to drill 6”-8” holes up to a depth of 200mt. We drill holes to last, using high penetration down the hole air hammers. The borehole is drilled to the required depth and water levels within the hole are monitored during the drilling.
Workskill Water Engineers uses air flush drilling method. This uses compressed air to drive the drilling tools attached to a rotary drilling rig. The air enables the drilling residue to be driven out of the hole to enable drilling to continue.
A by-product of air flush water borehole drilling is that once the water is found it too is driven out of the hole, the driller monitors the flow of water coming from the hole and uses this data to estimate the water level, quantity and re-charge rate of the borehole.
Depending on the geology being drilled we may have to install temporary steel casing to stop collapses during drilling. These sections of steel casing are screwed together to form a continuous run of casing that supports the side of the borehole and enables drilling to continue into harder and self supporting geology.
The requirement for casing can be established from the geological survey information supplied about the site. Once the water borehole drilling has been completed and the borehole is drilled to depth, the tools are removed from the hole, and the borehole is constructed by installing 3 meter lengths of casing with a diameter of 140mm into the hole.
The lower parts of the borehole are fitted with slotted casing. These precision cut 1mm slots allow water to percolate into the borehole. The top sections of casing are solid which prevent any surface water or contamination entering the water supply.