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Percussion drilling

269 bytes added, 19:50, 1 May 2012
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{{procontable | pro=
- Unlike any other drilling method percussion can remove boulders and break harder formations, effectively and quickly through most types of earth. <br>
- Percussion drilling can in principle deal with most ground conditions.<br>
- Can drill hundreds of feet (one well hand-drilled in China in 1923 was over 4000 feet deep). <br>
- Can drill further into the water table than dug wells, even drilling past one water table to reach another. <br>
| con= - The equipment can be very heavy and relatively expensive. <br>
- Especially in harder rock the method is slow (weeks, rather than days). <br>
Winona
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