循环接头
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。
Circulating Sub
The circulating sub is a specialized tool for circulating drilling fluid when running in casing on the way or
finishing running casing cording to actual needs.there are circulating sub with casing thread
and circulating sub with union thread.
Specificati*** and parameters of circulating Sub:
|
钻杆母螺纹 drilling pipe box thread |
套管螺纹 casing thread |
水眼borehole |
长度 length(mm)
|
|
NC38 |
5″偏梯扣BTC |
57 |
500 |
|
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 |
580 |
|
5-1/2″长圆扣LTC |
|||
|
5-1/2″短圆扣STC |
|||
|
NC50 |
7″偏梯扣BTC |
71 |
600 |
|
7″长圆扣LTC |
|||
|
7″短圆扣STC |
|||
|
NC50 |
9-5/8″偏梯扣BTC |
71 |
620 |
|
9-5/8″长圆扣LTC |
|||
|
9-5/8″短圆扣STC |
|||
|
NC50 |
10-3/4″偏梯扣BTC |
71 |
670 |
|
10-3/4″长圆扣LTC |
|||
|
10-3/4″短圆扣STC |
|||
|
NC50 |
13-3/8″偏梯扣BTC |
71 |
670 |
|
13-3/8″长圆扣LTC |
|||
|
13-3/8″短圆扣STC |