About the commercial borehole:

400mm diameter to 51m deep
Cased to 12m with steel casing- steel screen to base of borehole with 3mm slot
Sand pack behind well screen 5 to 10mm
Geology: soft sands and bands of sandstone

Public water supply problems

The borehole was pumping sand and there was infill at the base of the borehole.

Investigation using CCTV by our team showed that a hole in the flexible rising main, caused by torque twist, had punctured the well screen via the high velocity jetting action.

This allowed the sand pack and soft sand from the formation to flow into the borehole.

How we repaired the punctured well screen for the commercial water supply company

• Fabricated hydraulic (water only) casing “punch” to perforate the existing well screen allowing the remaining sand pack to flow into the screen.
• Removed remaining sand pack via an air lift eductor system and store for future use.
• Removed damaged well screen and install new stainless steel wedge wire screen and re-introduce the collected sand pack.
• Developed borehole to settle sand pack and re-install pump on a new rigid riser pipe.

As a result...

The public water supply borehole was returned to operational for the water supplier; the public was able to run their taps again.  Having issues with your water borehole?  Contact us to diagnose and solve all your water well dilemmas.