FLRT Bit |
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IADC 637G , Tricone Rock Bit, Medium Hard Formation , Sealed Friction Bearing , 311.2mm
RECOMMENDED DRILLING PARAMETERS FOR APPLICATION
Types & IADC Code | 417 | 437 447 | 517 527 | 517 527 | 537 547 | 617 627 | 637
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WOB | KN/mm(Bit Dia.) | 0.4~0.9 | 0.4~0.9 | 0.35~1.0 | 0.35~1.0 | 0.5~1.0 | 0.6~1.1 | 0.7~1.2 |
Lb/in. (Bit Dia.) | 2285~5142 | 2285~5142 | 2000~5714 | 2000~5714 | 2857~5714 | 3428~6285 | 4000~6857 | |
Rotation Speed (Rpm) | 140~60 | 240~70 | 125~50 | ~60 | 110~50 | 100~40 | 80~4 |
ROLLER CONE BIT BEARING ASSEMBLY
Journal bearing bits do not have roller bearings.
The cones are mounted directly onto the journal.
This offers the advantage of a larger contact area over which the load is transmitted from the cone to the journal.
The contact area is specially treated and inlaid with alloys to increase wear resistance.
Only a small amount of lubrication is required as part of the sealing system.
Ball bearings are still used to retain the cones on the journal.