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

5″短圆扣STC

NC38

5″偏梯扣BTC

57

400

5-1/2″长圆扣LTC

5-1/2″短圆扣STC

NC50

7″偏梯扣BTC

71

460

7″长圆扣LTC

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

13-3/8″短圆扣STC