311mm Tricone Rock Bit / Oil Drill Bit For Rock 6 5/8" API REG PIN API-7-1 Standard
311mm Rock Bit ,TCI Bit , 6 5/8" API REG. PIN , Tungsten Carbide Insert Gauge Protection
RECOMMENDED DRILLING PARAMETERS FOR APPLICATION
|
Types & IADC Code |
417 |
437 447 |
517 527 |
517 527 |
537 547 |
617 627 |
637
|
|
|
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 CUTTING STRUCTURE
Soft formation bits require deep penetration into the rock so the teeth are long, thin and widely spaced to prevent bit balling.
Bit balling occurs when soft formations are drilled and the soft material accumulates on the surface of the bit preventing the teeth from penetrating the rock.
The long teeth take up space, so the bearing size must be reduced. This is acceptable since the loading should not be excessive in soft formations.
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