| Specifications | Diameter | 89-550mm | ||
| Bearing Type | Rolling bearings: Standard configuration, including rollers, balls, and sliding bearing sleeves. Sealed bearings: Based on rolling bearings, a sealing system is added to prevent drilling fluid (mud) and cuttings from entering, and grease leakage is prevented, significantly improving bearing life. Air-cooled bearings: Used in special operating conditions such as air drilling. | |||
| Tooth Type | Milled teeth: Machined directly from the steel body of the roller cone. They have large teeth, good toughness, but lower hardness. Carbide is usually welded onto them to improve wear resistance. Suitable for soft to medium-hard formations. Inlaid teeth: Carbide (such as tungsten carbide) teeth are inlaid and brazed onto the roller cone body. The teeth are extremely hard and wear-resistant, but have weaker impact resistance. Various tooth shapes (such as wedge, cone, and spherical) are available to adapt to different formations. Suitable for hard, highly abrasive, and extremely hard formations. | |||
| Circulation Type | Mud fluid | |||
| Thread Connection | 3 1/2 REG male buckle 4 1/2 REG male buckle 65/8 REG male buckle 75/8 REG male buckle | |||
| Gauge Protection | Maintain wellbore diameter to extend drill bit life. | |||
| Shirttail Protection | Prevent erosion and wear on the drill bit body, protect internal bearings, and prevent roller cones from falling out. | |||
| Operating Parameters | IADC | recommend parameters | formation | |
| W O B (KN/mm) | RPM/min | |||
| 116、117/115 STEEL TOOTH | 0.35～0.8 | 150~80 | Extremly soft formation with low compressive strength and high drillability,such clay,mudstone,cretaceous | |
| 216、217/216 STEEL TOOTH | 0.4~1.0 | 100~60 | Soft to medium formation with low compressive strength,such as mid-soft shale,mid -soft limestone,mid-soft sandstone and soft formation with hard interbeds | |
| 417、437、415 SCOOP/CHISEL | 0.35~0.9 | 150~70 | Soft to medium formation with low compressive strength,such as mid-soft shale,mid -soft limestone,mid-soft sandstone and soft formation with hard interbeds | |
| 517、527/515 SCOOP/CHISEL | 0.35~1.0 | 140~60 | soft formation with low compressive strength ,such as mudstone,9ypsum,salinastone,soft shale and soft limestone | |
| 537、535 SCOOP/CHISEL | 0.45~1.0 | 120~50 | Soft to medium formation with low compressive strength,such as mid-soft shale,mid -soft limestone,mid-soft sandstone and mediumformation with harder abrasiveness interbeds | |
| 617、615 SCOOP | 0.45~1.1 | 90~50 | Mid-hard formation with high compressive strength,such as hard shale limestone,sandstone,and dolomite | |
| 637/635 CONICAL | 0.5~1.2 | 80~40 | Hard formation with high compressive strength,such as hard sandstone hard limestone,dolomite and anhydrite,marble | |
| 737/735 OVOID | 0.6~1.3 | 70~30 | Hard formation with high abrasiveness,eg.hard limestone dolomite,blaize,flint etc. | |
