Professional Analysis of Rock Drillability-Yikuang Technology

1. The concept of rock drillability: a comprehensive index reflecting the difficulty of drilling into rock under certain technical conditions. Generally, the ROP (m/h, m/s) is used as the drillability index.

2. Classification of rock drillability The rock drillability classification table frequently distributed by the former Ministry of Geology in 1958 and the diamond core drilling drillability classification table issued by the Ministry of Geology and Mining in 1984 both classified rock drillability into 12 grades.

3. There are four grades and twelve grades: soft - fairly drillable grades 1-3; medium hard - fairly drillable grades 4-6; hard - fairly drillable grades 7-9; hard - Fairly drillable level 10-12.

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