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Flushing the Blasthole

Published Thursday, January 01, 2004

Since there are no interruptions like testing or sample recovery involved in blasthole drilling, the aim is to drill the hole at the fastest penetration rate without causing excessive wear to the bit or drill string components. To achieve this, apart from other influencing factors such as rotary speed, thrust on the bit, percussion blow count and energy, it is equally important to choose ideal flushing conditions. To make this choice, one must consider the pros and cons of compressed air flushing. Today, blasthole drilling is done exclusively by rotary or rotary percussion drilling methods. The interaction between ...

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