TRICONE ROCK BIT
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TRICONE ROCK BIT
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Table of classification of formation hardness and bit selection |
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Roller cone bit IADC code |
IADC code of diamond bit |
Formation description |
Rock type |
Compressive strength (Mpa) |
ROP(m/h) |
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111/124 |
M/S112~M/S223 |
Very soft: sticky soft formation with low compressive strength. |
Clay Siltstone sandstone |
<25 |
>20 |
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116/137 |
M/S222~M/S323 |
Soft: soft formation with low compressive strength and high drill ability. |
Clay rock Marl Lignite sandstone |
25~50 |
10~20 |
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417/527 |
M/S323~M/S433 |
Medium soft: soft to medium formation with low compressive strength and steak. |
Clay rock Marl Lignite Sandstone Siltstone Anhydrite Tuff |
50~75 |
5~15 |
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517/537 |
M322~M443 |
Medium: medium to hard formation with high compressive strength and thin abrasive streak. |
Mudstone Dark rock shale |
75~100 |
2~6 |
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537/617 |
M422~M444 |
Medium hard: hard and dense formation with high compressive strength and medium abrasiveness. |
Dark rock Hard shale Anhydrite Sandstone Dolomite |
100~200 |
1.5~3 |
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IADC CODE SELECTION |
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| 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 | |||
