Well Drilling Tricone Rock Bit 12 1/4" FG635G With Gauge Protection
12 1/4" FG637G , Well Drilling Bit , Sealed Roller Bearing , With Gauge Protection , Tricone Rock Bit , TCI Bit
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 | |
Effects of Nozzle Configuration on Roller Cone Bit Performance
Direct hole bottom cleaning can involve the removal of discrete chips before they are re-ground or the erosion of rock flour, generated particularly by the action of blunt bit-teeth. In both these cases the hydraulics are working against chip hold-down forces related to the difference between the mud and pore pressurest . These can be reduced if the bit hydraulics limit the establishment of a low permeability skin on the hole bottom, thereby indirectly increasing the efficiency of hole bottom cleaning. It is expected that the removal of discrete chips will be controlled by the magnitude of the shear stresses and fluctuating pressures exerted on the chips by the flowing mud. On the other hand, the erosion of rock flour or mud cake will probably be controlled by the impact pressures on the hole bottom.
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