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循环接头是下套管中途或下完套管时循环钻井液用的专用接头。根据需要可分为套管螺纹循环接头和油壬螺纹循环接头（全规格）。
The circulating sub is a specialized tool for circulating drilling fluid when running in casing on the way or finishing running casing downhole.According to actual needs.there are circulating sub with casing thread and circulating sub with union thread.
技术规格及参数
| 连接螺纹型号 |
水眼 I.D. |
长度 |
| 钻杆母螺纹 |
套管螺纹 |
| NC38 |
5" 偏梯扣 |
57 |
500 |
| 5" 长圆扣 |
| 5" 短圆扣 |
| NC38 |
5 1/2" 偏梯扣 |
57 |
580 |
| 5 1/2" 长圆扣 |
| 5 1/2" 短圆扣 |
| NC50 |
7" 偏梯扣 |
71 |
600 |
| 7" 长圆扣 |
| 7" 短圆扣 |
| NC50 |
9 5/8" 偏梯扣 |
71 |
620 |
| 9 5/8" 长圆扣 |
| 9 5/8" 短圆扣 |
| NC50 |
10 3/4" 偏梯扣 |
71 |
670 |
| 10 3/4" 长圆扣 |
| 10 3/4" 短圆扣 |
| NC50 |
13 3/8" 偏梯扣 |
71 |
670 |
| 13 3/8" 长圆扣 |
| 13 3/8" 短圆扣 |
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