Well and borehole extension

Extending an existing borehole may provide access to a deeper water-bearing layer without starting a separate well.

Extending an existing well can reach a deeper aquifer while retaining the original borehole. A smaller drill bit is used to continue below the current bottom, provided the condition and diameter of the existing well allow the work. A more productive layer may increase the flow considerably, sometimes even doubling it.

A hydrogeological assessment before work helps establish the depth of the target aquifer and whether extension is justified. We select casing and screens for the new section where required. The actual result depends on the groundwater conditions and is verified by pumping rather than assumed in advance.

• Extension through the existing borehole
• Small drill bit for the available diameter
• Hydrogeological assessment before intervention
• Casing and screens for the new section
• Actual flow checked by pumping