No. | Diammeter of The First Section | Sections | Key Pressure Type | Length of per section(m) | Drill depth | Torque(KN.M) |
1 | ¢299 | 3 | | | Interlocking | 9-12 | 24-45 | 100 -120 |
2 | ¢342 | 3 | 4 | | Interlocking | 9 - 12 | 24-45 | 100 -120 |
3 | ¢355 | 3 | 4 | | Interlocking | 9 - 14 | 24 - 56 | 100-120 |
4 | ¢368 | 3 | 4 | | Interlocking | 9 - 14 | 24 - 56 | 150-180 |
5 | ¢377 | 3 | 4 | | Interlocking | 9 - 14 | 24 - 56 | 150-180 |
6 | ¢394 | 3 | 4 | | Interlocking | 9 - 15 | 24 - 58 | 180-200 |
7 | ¢406 | 3 | 4 | | Interlocking | 9 - 15 | 24 - 58 | 180-200 |
8 | ¢419 | 3 | 4 | | Interlocking | 9 - 15 | 24 - 58 | 200-230 |
9 | ¢440(445) | 3 | 4 | | Interlocking | 9 - 15 | 24 – 58 | 220-260 |
10 | ¢470 (482) | 3 | 4 | | Interlocking | 9 - 16 | 24 – 60 | 220-260 |
11 | ¢508 | 3 | 4 | | Interlocking | 9 – 18 | 24 – 68 | 260-360 |
12 | ¢530 (540) | 3 | 4 | 5 | Interlocking | 9 – 20 | 32 – 92 | 320-400 |
13 | ¢580 (575) | 3 | 4 | 5 | Interlocking | 9 – 20 | 32 – 92 | 360-420 |
14 | ¢630 | 3 | 4 | 5 | Interlocking | 9 - 22 | 32 - 102 | 400-500 |
Kelly bar is the key part of a drilling machine, and its quality directly affects the performance of the whole machine. Based on the rich manufacturing experience and by absorbing the advanced technology both at home and abroad,








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