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Rubber sealed sliding bearing bits are sealed by special type "O". Under the normal rotary speed conditions, they can stand high bit pressure. The bore surface of the cone has been treated with special techniaue in order to improve sliding motion of the bearing. And every performance is improved greatly.
1 O-shape seal ring with high saturation butadience acrylonitrile rubber improved the bearing sealed reliability.
2 To adapt high strength and toughness hard alloy teeth, the shock resistance has been increased and the breakage rate has been decreased.
3 The bearing contact surface, neck journal of jaw have been adapted to wear resistance alloy materials, the special craft processing has been applied in the bore surface of the cone which increases the load capability and the working life.
4 Optimized tooth number of cone and height of tungsten carbide tooth which improved the total cutting property and drilling footage.
5 High-performance lubricant grease has been applied in bearing which increased lubricating and protecting.
| IADC |
WOB |
RPM |
Applicable Formations |
| (KN/MM) |
(r/min) |
| (Bit Dia) |
| 116 117 |
0.35~0.8 |
150~80 |
Very soft formations with low compressive strength and high drillability,such as clay,mudston,chalk etc. |
|
| 126 127 |
0.35~0.9 |
150~70 |
Soft formations with low compressive strength and high drillability,such as mudstore,gypsum,salt,softshale.soft limestone,ect. |
|
| 136 137 |
0.35~1.0 |
120~60 |
Soft to mesium soft formations with low compressive strength and high drillability.such as medium soft shale,hard gypsum,medium soft limestone.medium soft sandstone soft formation with harder nterbeds,ect. |
|
| 216 217 |
0.4~1.0 |
100~60 |
Medium hard formations with high compressive strength,such as medium soft shale,hard gypsum,medium soft limestone,medium soft sandstone,soft formation with harder interbeds ect. |
|
| 246 247 |
0.4~1.0 |
80~50 |
Medium hard formations with high compressive strength,such as abrasive shale.limestone,sandstone,dolomite,hard gypsum,marble,ect. |
|
| 417 437 |
0.35~0.9 |
150~70 |
Very soft formations with low compressive strength and high drillability,such as clay,mudston,chalk,gypsum,salt,soft shale,soft limestone,etc. |
| 447 |
| 517 527 |
0.35~1.0 |
140~60 |
Soft formations with low compressive strength and high drillability,such as mudstore,gypsum,salt,soft shale.soft limestone,ect. |
|
| 537 547 |
0.45~1.0 |
120~50 |
Soft to medium formations with low compressive strength,such as medium soft shale,medium soft limestone,medium soft sandstone,medium formation with harder and abrasiver interbeds,ect. |
|
| 617 627 |
0.45~1.1 |
90~50 |
Medium hard formations with high compressive strength,such as hard shale,limestone,sandstone,dolomite,ect. |
|
| 637 |
0.5~1.2 |
80~40 |
Hard formations with high compressive strength,such as sandstone,limestone,dolomite,hard gypsum,marble,ect. |
