Year of Publishing
Practica Foundation, EnterpriseWorks/VITA
When a borehole is drilled, different types of sediment and rock layers can be encountered. To drill through all these different layers a range of manual drilling techniques have been developed and are used around the globe. In each case the drilling technique must (a) break or cut the layers, (b) remove the cut material from the hole, and (c) if necessary provide support to the walls of the hole, to prevent collapse during drilling.
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UNICEF (2009) Manual Drilling Techniques. , Practica Foundation, EnterpriseWorks/VITA , UNICEF
Manual Drilling Techniques
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