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Foam drilling.

When drilling with compressed air a water injection pump can be used to help the drilling action – lifting material from the hole – these are built into all PAT wheeled machines – supplied as separate units on 301 Skid machine.

Click for more explanation on compressor air drilling Chapter 4

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Important Note.

Whatever drilling method is suitable all equipment is sized for the diameter of the hole being drilled – this sizing relates to the cross sectional area of the hole – the larger the area the larger the mud pump or compressor flow needs to be.

Given that a 4” 100mm diameter hole is 25% the area of an 8” 200mm hole – this makes a very significant difference to the size and cost of the ancillary equipment

Mobilisation of equipment.

To be effective a drilling machine needs to be able to access the drill site easily without time delay and high expense – however equal consideration needs to be given to carriage all the other essential items required to complete the borehole construction.

Note

If Mud Drilling a typical hole might require 3 – 10,000 litres of water hauled to drill site (or piped from a convenient source)
When drilling with Down the hole hammer – most compressor units outweigh the PAT drilling machine they complement.
Well casing, screen, gravel pack and well apron construction materials all have to be efficiently hauled to site.

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