lifting sub is manufactured from high-strength alloy steel, and fully heat treated. According to the shape of the up shoulder, it comes in two types: the sloping shoulder lifting sub and the straight shoulder lifting sub. It is mainly used for ascension drill collars and other special tools.
Specification Series and Performance Parameters
Normal size
Mm(in)
|
I.D
Mm(in)
|
Connection
API
|
Outside diameter
of drill rod
mm(in)
|
Outside diameter
of slip ending
Mm(in)
|
73.0(2 7/8)
|
31.8(1 1/4")
|
NC23
|
78.4(3 1/8)
|
111.1(4 2/5")
|
44.5(1 3/4")
|
NC26
|
88.9(3 1/2)
| ||
88.9(3 1/2)
|
54.0(2 1/8")
|
NC31
|
104.8(4 1/8)
|
127.0(5")
|
50.8(2")
|
NC35
|
120.7(4 3/4)
| ||
68.3(2 7/10")
|
NC38
|
127.0(5)
| ||
127.0(5)
|
71.4(2 4/5")
|
NC44
|
152.4(6)
|
168.3(6 3/5")
|
158.8(6 1/4)
| ||||
82.6(3 1/4")
|
NC46
|
165.1(6 1/2)
| ||
171.5(6 3/4)
| ||||
95.3(3 3/4")
|
NC50
|
177.8(7)
| ||
184.2(7 1/4)
| ||||
NC56
|
196.8(7 3/4)
| |||
127.0(5)
|
203.2(8)
|
168.3(6 3/5")
| ||
65/8REG
|
209.6(8 1/4)
| |||
95.3(3 3/4")
|
NC61
|
228.6(9)
| ||
7 5/8REG
|
241.3(9 1/2)
| |||
NC70
|
247.7(9 3/4)
| |||
254.0(10)
| ||||
NC77
|
279.4(11)
|
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