| IADC |
WOB |
RPM |
Application |
| KN/mm |
r/min |
| 111/114/115 |
0.3-0.75 |
150-80 |
very soft formations with low compressive strength and high drill ability, likes caly, mudstone, chalk |
| 116/117 |
0.35-0.8 |
150-80 |
very soft formations with low compressive strength and high drill ability, likes clay, musdstone, chalk |
| 121 |
0.3-0.85 |
150-80 |
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 formaitons with low compressive strength, like medium, soft shake, medium soft limiestone, 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 |
| 216/217 |
0.4-1.0 |
240-70 |
medium formations with high compressive strength, like medium soft shale, hard gypsum, medium soft limiestone, medium soft sandstone, soft formation with harder interbeds |
| 246/247 |
0.4-1.0 |
80-50 |
| 321 |
0.4-1.0 |
150-70 |
medium hard formation with high compressive strength, like hard shale, limestone, sandstone, dolomite |
| 417 |
0.35-0.9 |
240-70 |
very soft formations with low compressive strength and high drillability, such as clay, mudstone, chalk, gypsum, salt, soft shale, soft limestone, etc. |
| 324 |
0.4-1.0 |
120-50 |
medium abrasive formations like abrasive shale, liimestone, sandstone, dolomite, hard gypsum, marble |
| 415 |
|
|
| 437/447/435 |
0.35-0.9 |
150-70 |
| 517/527/515 |
0.35-1.0 |
140-60 |
very soft formations with low compressive strength and high drill ability, like clay, mudstone, chalk, gypsum, salt, soft limestone |
| 532 |
0.35-1.0 |
110-80 |
Suitable for soft strata with low compressive strength. Such as shale, soft limestone, dolomite with interlayer, coal seam and so on |
| 537/547/535 |
0.45-1.0 |
120-50 |
soft formations with low compressive strength and high drill ability, likes mudstone, gypsum, salt, soft limiestone. |
| 617/615 |
0.45-1.1 |
100-60 |
soft to medium formations with low compressive strenght, like medium soft shale, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds. |
| 632 |
0.45-1.1 |
100-60 |
Suitable for high compressive strength, medium hard and abrasive formation. Such as limestone, sandstone, dolomite and so on |
| 637/635 |
0.5-1.1 |
100-60 |
medium hard formationwith high compressive strength, like hard shale, limestone, sandstone, dolomite. |
| 735 |
0.45-1.1 |
100-60 |
Suitable for high compressive strength, hard and high abrasive formation, such as granite, limestone, sandy shale, dolomite and so on |
| 737 |
0.5-1.1 |
80-40 |
hard formation with high compressive strength like limestone, sandstone, dolomite, hard gypsum, marble. |
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