Customization: | Available |
---|---|
Customized: | Customized |
Standard: | API |
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IADC
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WOB(KN/mm Bit Dia.)
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RPM(r/min)
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Applicable Formations
|
435
515 |
0.20~0.70
|
200~80
|
Soft with very low compressive strength such as shale ,clay, sandstone ,soft limestone ,etc
|
535
|
0.35~0.80
|
200~80
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Medium soft with low compressive strength and harder abrasive stringers ,such as hard shale ,hared gypsolyte, soft limestone,
sandstone and dolomite with stringer ,etc |
417
437 |
0.35~0.90
|
140~70
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Very soft with low compressive strength and high drillability, such as shale, clay, sandstone and conglomerate ,etc.
|
517
527 |
0.35~1.05
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120~50
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Soft with low compressive strength, such as shale, clay, sandstone, soft limestone, salt bed and hard gypsolyte, etc
|
537
547 |
0.35~1.05
|
110~40
|
Medium soft with low compressive strength and harder abrasive stringers, such as hard shale, hard gypsolyte, soft limestone,
sandstone and dolomite with stringers ,etc |
617
627 |
0.35~1.05
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80~40
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Medium hard with high compressive strength and thick &hard stringers, such as hard shale, limestone, sandstone and dolomite, etc
|
637
737 |
0.70~1.20
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70~40
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Medium hard with high compressive strength and high abrasiveness ,such as limestone ,dolomite, sandstone and chert ,etc
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Note: The upper limits of WOB and RPM in above table should not be used simultaneously
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