Parameter
Series: rubber rings-rolling bearings
Description
Characteristic of bearing structure
1.Tricone bit use Sealed roller bearing structure. With rollers arranged in grooves recessed in the cone body, the size of the bearing journal is increased.
2. Thrust bearing surfaces are hardfaced and treated with friction reducing technology.
3. Ball locked cone, suitable for high rotary speed.
4. New type of wear resistant grease that can sustain high temperature up to 250°C is utilized.
Characteristic of Predominance technology
Inserted tricone bit is rubber O-ring sealed roller bearing bit, which is the economical and ideal tool for drilling applications where high RPM and medium to low WOB are required.
SPECIFICATIONS
Bit size | Bit type | API Regular Pin
（in） | Recommended make-up torque for bit shank（KN.m） | Inch (in) | Metric (mm) | 8 1/2 | 215.9 | LG415、LG435 LG515、LG535 | 4 1/2 | 16.3～21.7 | 91/2 | 241.3 | LG415、LG435 LG515、LG535 | 6 5/8 | 37.9～43.3 | 12 1/4 | 311.2 | LG415、LG435 LG515、LG535 | 6 5/8 | 37.9～43.3 |
Recommended operating parameters of LG×××G series roller cone bits
Bit type | Normal WOB
kN/mm
（bit dia.） | Rotary Speed （rpm） | Cutting structure | Applicable formation | LG415 | 0.20～0.60 | 200～80 | Large dia. offset crested scoop compacts in inner row, wedge
compacts in outer row | Very soft with very low compressive strength, such as shale, clay,
sandstone and soft limestone, etc. | LG435 | 0.20～0.70 | 200～80 | Large dia. offset crested scoop compacts in inner row, wedge
compacts in outer row | Soft with low compressive strength, such as shale, clay, sandstone,
soft limestone, salt bed and hard gypsolyte, etc. | LG515 | 0.25～0.80 | 200～80 | Offset crested scoop compacts in inner row, wedge compacts in outer
row and inequable spaced compacts arrangement | Soft with low compressive strength, such as shale, clay, sandstone,
soft limestone, salt bed and hard gypsolyte, etc. | LG535 | 0.35～0.80 | 200～80 | Offset crested scoop compacts in inner row, wedge compacts in outer
row and inequable spaced compacts arrangement | Medium soft with low compressive strength and harder abrasive
stringers, such as hard shale, hard gypsolyte, soft limestone,
sandstone and dolomite with stringers, etc. |
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