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| Table of classification of formation hardness and bit selection | |||||
| Roller cone bit | IADC code of diamond bit | Formation description | Rock type | Compressive strength(Mpa) | ROP(m/h) |
| IADC code | |||||
| 111/124 | M/S112~M/S223 | Very soft:sticky soft formation with low compressive strength. | Clay | <25 | >20 |
| Siltstone | |||||
| sandstone | |||||
| 116/137 | M/S222~M/S323 | Soft:soft formation with low compressive strength and high drillability. | Clay rock | 25~50 | 10~20 |
| Marl | |||||
| Lignite | |||||
| sandstone | |||||
| 417/527 | M/S323~M/S433 | Medium soft:soft to medium formation with low compressive strength and steak. | Clay rock | 50~75 | 5~15 |
| Marl | |||||
| Lignite | |||||
| Sandstone | |||||
| Siltstone | |||||
| Anhydrite | |||||
| Tuff | |||||
| 517/537 | M322~M443 | Medium:medium to hard formation with high compressive strength and thin abrasive streak. | Mudstone | 75~100 | 2~6 |
| Dark rock | |||||
| shale | |||||
| 537/617 | M422~M444 | Medium hard:hard and dense formation with high compressive strength and medium abrasiveness. | Dark rock | 100~200 | 1.5~3 |
| Hard shale | |||||
| Anhydrite | |||||
| Sandstone | |||||
| Dolomite | |||||
| IADC CODE SELECTION | |||||
| IADC | WOB | RPM | Application | ||
| (KN/mm) | (r/min) | ||||
| 111/114/115 | 0.3-0.75 | 200-80 | very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk | ||
| 116/117 | 0.35-0.8 | 150-80 | very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk | ||
| 121 | 0.3-0.85 | 200-80 | soft formations with low compressive strength and high drill ability, like mudstone, gypsum, salt, soft limestone | ||
| 124/125 | 180-60 | ||||
| 131 | 0.3-0.95 | 180-80 | soft to medium formations with low compressive strength, like medium, soft shake, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds | ||
| 136/137 | 0.35-1.0 | 120-60 | |||
| 211/241 | 0.3-0.95 | 180-80 | medium formations with high compressive strength, like medium, soft shake, hard gypsum, medium soft limestone, medium soft sandstone, soft formation with harder interbeds. | ||
| 216/217 | 0.4-1.0 | 100-60 | |||
| 246/247 | 0.4-1.0 | 80-50 | medium hard formation with high compressive strength, like hard shale, limestone, sandstone, dolomite | ||
| 321 | 0.4-1.0 | 150-70 | medium abrasive formations, like abrasive shale, limestone, sandstone, dolomite, hard gypsum, marble | ||
| 324 | 0.4-1.0 | 120-50 | |||
| 437/447/435 | 0.35-0.9 | 240-70 | very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk, gypsum, salt, soft limestone | ||
| 517/527/515 | 0.35-1.0 | 220-60 | soft formations with low compressive strength and high drill ability, like mudstone, gypsum, salt, soft limestone | ||
| 537/547/535 | 0.45-1.0 | 220-50 | soft to medium formations with low compressive strength, like medium, soft shake, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds | ||
| 617/615 | 0.45-1.1 | 200-50 | medium hard formation with high compressive strength, like hard shale, limestone, sandstone, dolomite | ||
| 637/635 | 0.5-1.1 | 180-40 | hard formation with high compressive strength, like limestone, sandstone, dolomite, hard gypsum, marble | ||
| Note: Above limits of WOB and RRPM should not be used simultaneously | |||||
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