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IADC | WOB(kN/mm) | RPM (r/min) | Suitable formation | |||
417 | 0.35~0.90 | 140~70 | Very soft with low compressive strength and high drillability,such as shale,clay,sandstone and conglomerate,etc. | |||
437 | 0.35~0.95 | 140~60 | Very soft with low compressive strength and high drillability,such as shale,clay,sandstone and conglomerate,etc. | |||
517 | 0.35~1.05 | 120~50 | Soft with low compressive strength and high drillability,such as shale,clay,sandstone and soft limestone,etc. | |||
537 | 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 | 0.35~1.05 | 80~40 | Medium hard with high compressive strength and thick&hard stringers,such as hard shale,limestone, sandstone and dolomite,etc. | |||
637 | 0.70~1.20 | 70~40 | Medium hard with high compressive strength and high abrasiveness,such as limestone,dolomite, sandstone and chert.ect. | |||
Note:The upper limits of WOB and RPM in above table should not be used simultaneously. |
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