311.2mm , FSA537G , TRC Bit , Roller Cone Bit, TCI Bit, Medium Hard
Formation , Oil Well Drilling
Roller cone bit design goals
Roller-cone bit design goals expect the bit to do the following:
Function at a low cost per foot drilled.
Have a long downhole life that minimizes requirements for tripping.
Provide stable and vibration-free operation at the intended
rotational speed and weight on bit (WOB).
Cut gauge accurately throughout the life of the bit.
To achieve these goals, bit designers consider several factors.
Among these are:
The formation and drilling environment.
Expected rotary speed.
Expected weight on bit (WOB).
Hydraulic arrangements.
Anticipated wear rates from abrasion and impact.
Design focal points include:
The bit body
Cone configurations
Cutting structures
Metallurgical, tribological, and hydraulic considerations in
engineering bit design solutions. (Tribology is a science that
deals with the design, friction, wear, and lubrication of
interacting surfaces in relative motion.)
RECOMMENDED DRILLING PARAMETERS FOR APPLICATION
| Types & IADC Code | 417 | 437 447 | 517 527 | 537 547 | 617 627 | 637 |
| WOB | KN/mm(Bit Dia.) | 0.4~0.9 | 0.4~0.9 | 0.35~1.0 | 0.5~1.0 | 0.6~1.1 | 0.7~1.2 |
| Lb/in. (Bit Dia.) | 2285~5142 | 2285~5142 | 2000~5714 | 2857~5714 | 3428~6285 | 4000~6857 |
| Rotation Speed (Rpm) | 140~60 | 140~60 | 125~50 | 110~50 | 100~40 | 80~40 |
