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| 起源の場所 | 中国 |
| ブランド名 | ROSCHEN |
| 証明 | ISO |
| モデル番号 | 8 1/2 "。121/4" |
| Length | Taper-length |
| Type | Center Drill Bit |
| Material | High Carbon Steel |
| Usage | Well Drilling |
| Body Material | Alloy steel |
| Bearing Type | Friction/Roller/Floating Bearing Bit |
| Drilling Formation | Soft to Hard |
| Available Size | 3 Inch - 30 Inch |
| Specification | 8 1/2'' |
| IADC | WOB(kn/mm) | RRM(r/min) | Applicable Formations |
|---|---|---|---|
| 116 117 | 0.35~0.8 | 150~80 | Very soft formations with low compressive strength |
| 126 127 | 0.35~0.9 | 150~70 | Soft formations with low compressive strength |
| 136 137 | 0.35~1.0 | 120~60 | Soft to medium soft formations |
| 216 217 | 0.4~1.0 | 100~60 | Medium hard formations |
| 246 247 | 0.4~1.0 | 80~50 | Medium hard abrasive formations |
| Domestic Market | 50.00% |
| Eastern Asia | 10.00% |
| Mid East | 10.00% |
| North America | 5.00% |
| South Asia | 5.00% |
