





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,分为套管螺纹循环接头和由壬螺纹循环接头。
循环接头技术参数如下
|
钻杆母螺纹 |
套管螺纹 |
水眼mm |
长度mm |
|
NC38 |
5″偏梯扣BTC |
57 |
400 |
|
5″长圆扣LTC |
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|
5″短圆扣STC |
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|
NC38 |
5″偏梯扣BTC |
57 |
400 |
|
5-1/2″长圆扣LTC |
|||
|
5-1/2″短圆扣STC |
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|
NC50 |
7″偏梯扣BTC |
71 |
460 |
|
7″长圆扣LTC |
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|
7″短圆扣STC |
|||
|
NC50 |
9-5/8″偏梯扣BTC |
71 |
460 |
|
9-5/8″长圆扣LTC |
|||
|
9-5/8″短圆扣STC |
|||
|
NC50 |
10-3/4″偏梯扣BTC |
71 |
480 |
|
10-3/4″长圆扣LTC |
|||
|
10-3/4″短圆扣STC |
|||
|
NC50 |
13-3/8″偏梯扣BTC |
71 |
480 |
|
13-3/8″长圆扣LTC |
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|
13-3/8″短圆扣STC |