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加重钻杆的壁厚介于钻杆和钻铤之间，其结构形式类似钻杆是选用优质合金结构钢制作，其两端接头体及中间加厚部位焊有耐磨带。技术参数符合API Spec7-1标准。
The wall thickness of heavy weight drill pipe is between drill pipe and drill collar,its structure is simliar with drill pipe.It is made from premium alloyed steel.Its both tool joints and middle upset are welded hardbands.Technical parameters meet with API Spec7-1 Standard.
技术规格及参数
Thechnical specifications and parameters
| 尺寸Size |
外径O.D. |
内径I.D. |
接头外径Tool Joint O.D. |
接头内径Tool Joint I.D. |
连接扣型Thread type |
最大吊卡直径Max.elevator diameter |
中间加厚直径Central upset dia. |
最小通径尺寸Min drift dia.size |
| 3 1/2 |
3 1/2 |
2 1/4 |
4 3/4
(4 7/8, 5) |
2 1/4 |
NC38 |
3 7/8 |
4 |
2 |
| 2 1/16 |
2 1/16 |
2 13/16 |
| 4 |
4 |
2 1/2 |
5 1/4 |
2 1/2 |
NC40 |
4 3/16 |
4 1/2 |
2 1/4 |
| 2 9/16 |
2 9/16 |
2 5/16 |
| 4 1/2 |
4 1/2 |
2 11/16 |
6 1/4 |
2 11/16 |
NC46 |
4 11/16 |
5 |
2 17/16 |
| 2 3/4 |
2 3/4 |
2 1/2 |
| 2 13/16 |
2 13/16 |
2 9/16 |
| 5 |
5 |
3 |
6 5/8 |
3 |
NC 50 |
5 1/8 |
5 1/2 |
2 3/4 |
| 5 1/2 |
5 1/2 |
3 1/4 |
7
(7 1/4, 7 1/2) |
3 1/4 |
5 1/2FH |
5 11/16 |
6 |
3 |
| 3 3/8 |
3 3/8 |
3 1/8 |
| 3 7/8 |
3 7/8 |
3 5/8 |
| 4 |
4 |
3 3/4 |
| 6 5/8 |
6 5/8 |
4 |
8
(8 1/4, 8 1/2) |
4 |
6 5/8FH |
6 15/16 |
7 1/8 |
3 3/4 |
| 4 1/2 |
4 1/2 |
4 1/4 |
| 5 |
5 |
4 3/4 |
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