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
循环接头参数如下:
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 |
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 |
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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 |
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nc50 |
9-5/8′偏梯扣btc |
71 |
460 |
9-5/8′长圆扣ltc |
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9-5/8′短圆扣stc |
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nc50 |
10-3/4′偏梯扣btc |
71 |
480 |
10-3/4′长圆扣ltc |
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10-3/4′短圆扣stc |
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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 |