| Customization: | Available |
|---|---|
| Customized: | Customized |
| Standard: | API |
|
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|
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17 1/2 inch
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444.5mm
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IADC Code
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537
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Thread Connection
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7 5/8REG
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Operating Parameters
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WOB (Weight On Bit)
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0.35~1.05
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RPM
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120~50
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Formation
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Medium formation with high compressive strength ,such as medium soft shale,medium softlimestone,medium soft sandstone,medium formation with harder and abrasive interbeds,etc.
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IADC
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Rock formation
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WOB (KN/mm)
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PRM(r/min)
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417/427/437
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Low compressive strength, high drill-ability and extremely soft formation, like shale, clay, sandstone, conglomerate etc
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0.35~0.90
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140~70
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447
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Low compressive strength, high drill-ability and soft formation, like shale, clay, sandstone, soft limestone, salt rock, plaster etc.
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0.35~1.00
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140~60
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517
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Low compressive strength, high drill-ability and soft formation, like shale, clay, sandstone, soft limestone, salt rock, etc
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0.35~1.05
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120~50
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527
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Soft formation with low compressive, like Low compressive strength, high drill-ability and soft formation, like shale, clay, sandstone, soft limestone, salt rock, anhydrite etc.
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0.35~1.05
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120~50
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537/547
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Low compressive strength, medium hard formation with hard abrasive interlayer, like Hard shale, anhydrite, soft limestone, sandstone, dolomite with mezzanine, etc.
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0.50~1.05
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110~40
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High compressive strength, medium hard and thick hard interlayer, like hard shale, limestone, sandstone, dolomite, etc.
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0.50~1.05
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80~40
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High compressive strength, medium hard and high abrasive formation, like limestone, dolomite, sandstone, chert, etc.
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0.7~1.20
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70~40
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