Drill Collar
Time：2016/11/06 Traffic：
| Drill Collar Technical Parameter | |||||
| OD+4mm | Connection | ID+1.59mm | Length±152.4mm |
Chamfering Diameter ±0.4mm |
Length of one spiral ±25.4mm |
| 79.4 | NC23 | 31.8 | 9140 or 9450 | 76.2 | 679 |
| 88.9 | NC26 | 38.1 | 9140 or 9450 | 82.9 | 679 |
| 104.8 | NC31 | 50.8 | 9140 or 9450 | 100.4 | 914 |
| 114.3 | NC31 | 50.8 | 9140 or 9450 | 100.4 | 914 |
| 120.6 | NC35 | 50.8 | 9140 or 9450 | 114.7 | 965 |
| 127 | NC38 | 57.2 | 9140 or 9450 | 121 | 965 |
| 139.7 | NC40 | 57.2 | 9140 or 9450 | 132.2 | 1067 |
| 158.8 | NC46 | 71.4 | 9140 or 9450 | 144.5 | 1067 |
| 168.3 | NC50 | 71.4 | 9140 or 9450 | 154.8 | 1168 |
| 177.8 | NC50 | 71.4 | 9140 or 9450 | 164.7 | 1168 |
| 196.8 | NC50/NC56 | 71.4 | 9140 or 9450 | 185.3 | 1626 |
| 203.2 | NC56/6 5/8REG | 71.4 | 9140 or 9450 | 190.1 | 1727 |
| 209.6 | 6 5/8REG | 71.4 | 9140 or 9450 | 195.6 | 1727 |
| 215.9 | 6 5/8REG | 71.4 | 9140 or 9450 | 195.6 | 1727 |
| 228.6 | 6 5/8REG | 71.4 | 9140 or 9450 | 212.7 | 1829 |
| 241.3 | 7 5/8REG | 76.2 | 9140 or 9450 | 223.8 | 1829 |
| 254 | 7 5/8REG/8 5/8REG | 76.2 | 9140 or 9450 | 237.3 | 1930 |
| 279.4 | 8 5/8REG | 76.2 | 9140v9450 | 266.7 | 2032 |
