Milled Tooth Bit , Side Nozzle , Jetted Bit , TCI Tricone Bit ,
Sealed RollerBearing
RECOMMENDED DRILLING PARAMETERS FOR APPLICATION
| Types & IADC Code | 117 | 127 | 437 447 | 517 527 | 537 547 | 617 627 | 637
|
| WOB | KN/mm(Bit Dia.) | 0.35~0.8 | 0.35~0.9 | 0.35~0.9 | 0.35~1.0 | 0.45~0.95 | 0.45~1.1 | 0.5~1.1 |
| Lb/in. (Bit Dia.) | 2000~4271 | 2000~5142 | 2000~5142 | 2000~5714 | 2571~5714 | 2571~6285 | 2857~6285 |
| Rotation Speed (Rpm) | 240~80 | 240~70 | 180~80 | 220~60 | 220~50 | 200~50 | 180~40 |
RECOMMENDED DRILLING PARAMETERS FOR APPLICATION
| Types & IADC Code | 114 115 | 124 125 | 134 135 | 214 215 | 244 245 | 324 325 |
| WOB | KN/mm(Bit Dia.) | 0.3~0.75 | 0.3~0.85 | 0.3~0.95 | 0.35~0.95 | 0.35~0.95 | 0.4~1.0 |
| Lb/in. (Bit Dia.) | 1712~4285 | 1715~4857 | 1715~5428 | 2000~5428 | 2000~5428 | 2285~5714 |
| Rotation Speed (Rpm) | 200~80 | 200~80 | 180~80 | 180~80 | 180~60 | 150~60
|
Roller Cone Bit Seal Definitions
In a rotating bearing, the two working sides of a seal are called
the static energizer and the dynamic wear face. These two parts are
directly opposite each other, with the energizing portion bearing
on the gland and the dynamic wear face bearing against the rotating
unit. For the energizing portion of the seal to function properly,
it must have a surface against which to react. This is provided by
a channel-shaped groove called a seal gland.
The wearing portion of the seal must have the capability to
withstand the heat and abrasion generated as the rotating surface
passes over it. The energizer, when functioning correctly, is not a
high-wear area. Ideally, it simply bears against the gland and
provides the pushing energy that maintains firm contact between the
wear surface and rotating cone.
O-rings
Donut-shaped O-rings are used in many roller-cone bit applications.
O-rings are manufactured from elastomers (synthetic rubbers) that
withstand the temperatures, pressures, and chemicals encountered in
drilling environments. They are a traditional, but still
consistently reliable, seal system.
An O-ring is installed in a seal gland to form a seal system. The
gland holds the O-ring in place and is sized so that the O-ring is
compressed between the gland and the bearing hub at which sealing
is required. It presses the interior wall of the O-ring against the
hub and the exterior diameter of the O-ring against the gland.
These latter forces prevent the seal from turning in the gland and
experiencing wear on the outer surfaces by rotational contact with
the gland.
