Drill collar

Drill collar is made of rolled or forged AISI 4145H chrome molybdenum alloy steel for effective control of chemical composition and trace element content.
Drill collar is at the lowest part of the drill string and is the main component of the lower drill assembly. Its main feature is the wall thickness (usually 38 ~ 53mm, equivalent to the drill pipe wall thickness of 4 to 6 times), with greater gravity and stiffness.

Drill collar parameters

Nominal size
D
d
Lmm
DF(mm)
Bending Strength ratio
mm
In
mm
in
NC31-41(2-7/8IF)
104.8
4-1/8
50.8
2
9150
100.4
2.43:1
NC35-47
120.7
4-3/4
50.8
2
9150
114.7
2.58:1
NC38-50(3-1/2IF)
127.0
5
57.2
2-1/4
9150
121.0
2.38:1
NC44-60
152.4
6
57.2
2-1/4
9150/9450
144.5
2.49:1
NC44-60
152.4
6
71.4
2-13/16
9150/9450
144.5
2.84:1
NC44-62
158.8
6-1/4
57.2
2-1/4
9150/9450
149.2
2.91:1
NC46-62(4IF)
158.8
6-1/4
71.4
2-13/16
9150/9450
150.0
2.63:1
NC46-65(4IF)
165.1
6-1/2
57.2
2-1/4
9150/9450
154.8
2.76:1
NC46-65(4IF)
165.1
6-1/2
71.4
2-13/16
9150/9450
154.8
3.05:1
NC46-67(4IF)
171.4
6-3/4
57.2
2-1/4
9150/9450
159.5
3.18:1
NC50-67(4-1/2IF)
171.4
6-3/4
71.4
2-13/16
9150/9450
159.5
2.37:1
NC50-70(4-1/2IF)
177.8
7
57.2
2-1/4
9150/9450
164.7
2.54:1
NC50-70(4-1/2IF)
177.8
7
71.4
2-13/16
9150/9450
164.7
2.73:1
NC50-72(4-1/2IF)
184.2
7-1/4
71.4
2-13/16
9150/9450
169.5
3.12:1
NC56-77
196.8
7-3/4
71.4
2-13/16
9150/9450
185.3
2.70:1
NC56-80
203.2
8
71.4
2-13/16
9150/9450
190.1
3.02:1
6-5/8REG
209.6
8-1/4
71.4
2-13/16
9150/9450
195.7
2.93:1
NC61-90
228.6
9
71.4
2-13/16
9150/9450
212.7
3.17:1
7-5/8REG
241.3
9-1/2
76.2
3
9150/9450
223.8
2.81:1
NC70-97
247.6
9-3/4
76.2
3
9150/9450
232.6
2.57:1
NC70-100
254.0
10
76.2
3
9150/9450
237.3
2.81:1


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