 |
IADC | WOB (KN/mm) | RPM (r/min) | Applicable Formations |
417/437/ 447/415/435 | 0.35~0.9 | 150~70 | Very soft formations with low compressive strength and high drillability, such as clay, mudstone, chalk, gypsum, salt, soft limestone, etc. |
517/527/515 | 0.35~1.0 | 140~60 | Soft formations with low compressive strength and high drillability, such as mudstone, gypsum, salt, soft limestone, etc. |
537/547/535 | 0.45~1.0 | 120~50 | Soft to medium formations with low compressive strength, such as medium, soft shale, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds, etc. |
617/615 | 0.45~1.1 | 90~50 | Medium hard formation with high compress strength, such as hard shale, limestone, sandstone, dolomite. etc |
637/635 | 0.5~1.2 | 80~40 | Hard formations with high compressive strength, such as sandstone, limestone, dolomite ,hard gypsum, marble, etc. |
Note: The upper limits of WOB and RPM in above table should not be used simultaneously. | |||
Regular Models
8 3/4'' 617 
15 1/2'' 517
9 5/8'' 737
12 1/4'' 537
6 1/2'' 537
8 1/2'' 517
108mm 437
6 1/2'' 217
12 1/4''637
6'' 517
PDC 6 1/4''
PDC 4 3/4''
Drag bit 12''
8 1/2'' single cone
8 1/2'' single cone
Hole Opener 18''
Hole Opener 12''
8 1/2'' single cone
Stabilizer
Reamer 17 1/2''
IADC | WOB (KN/mm) | RPM (r/min) | Applicable Formations |
417/437/ 447/415/435 | 0.35~0.9 | 150~70 | Very soft formations with low compressive strength and high drillability, such as clay, mudstone, chalk, gypsum, salt, soft limestone, etc. |
517/527/515 | 0.35~1.0 | 140~60 | Soft formations with low compressive strength and high drillability, such as mudstone, gypsum, salt, soft limestone, etc. |
537/547/535 | 0.45~1.0 | 120~50 | Soft to medium formations with low compressive strength, such as medium, soft shale, medium soft limestone, medium soft sandstone, medium formation with harder and abrasive interbeds, etc. |
617/615 | 0.45~1.1 | 90~50 | Medium hard formation with high compress strength, such as hard shale, limestone, sandstone, dolomite. etc |
637/635 | 0.5~1.2 | 80~40 | Hard formations with high compressive strength, such as sandstone, limestone, dolomite ,hard gypsum, marble, etc. |
Note: The upper limits of WOB and RPM in above table should not be used simultaneously. | |||
Regular Models
8 3/4'' 617 15 1/2'' 517
9 5/8'' 737
12 1/4'' 537
6 1/2'' 537
8 1/2'' 517
108mm 437
6 1/2'' 217
12 1/4''637
6'' 517
PDC 6 1/4''
PDC 4 3/4''
Drag bit 12''
8 1/2'' single cone
8 1/2'' single cone
Hole Opener 18''
Hole Opener 12''
8 1/2'' single cone
Stabilizer
Reamer 17 1/2''
