Abstract
ABSTRACT Drilling is a pre-requisite operation in mining, oil and constructional industry. The choice of drilling method depends on rock properties, specific production requirement, equipment availability, size and shape of tools, nature of forces, etc. For economical drilling, higher drilling rate with minimum bit wear is required. Drillability of rock is useful guide for evaluating the suitability of drills for different ground conditions. The microbit drilling machine, full scale drag-bit rotary drilling arrangement and percussive drilling arrangements for determining the drillability of rocks and rock abrasivity measuring instruments vers made in the department. The present study covers the performance of different drilling methods in some Indian rocks. An attempt has also been made to establish correlation between drillability and some physico-mechanical properties.
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