Product Description
Drill collar is mainly used to provide bit weight to drill bit so that drill pipe is in tension. Especially drill collar can keep drill bit centralized and hole track by large rigidity. Drill collar are manufactured strictly by the standard API Spec7-1 and SY/T5411.
|
Technical specification and parameters
|
Drill collar
|
Outside diameter
|
Inside diameter
|
Length
|
Bevel Diameter
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Ref. bending
|
|
Number
|
mm
|
in
|
mm
|
in
|
mm
|
Strength Ratio
|
|
NC23-31
|
79.4
|
3 1/8
|
31.8
|
1 1/4
|
9150
|
76.2
|
2.57：1
|
|
NC26-35(2 3/8 IF)
|
88.9
|
3 1/2
|
38.1
|
1 1/2
|
9150
|
82.9
|
2.42：1
|
|
NC31-41(2 7/8 IF)
|
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 1/2 IF)
|
127
|
5
|
57.2
|
2 1/4
|
9150
|
121
|
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
|
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 1/2 IF)
|
171.4
|
6 3/4
|
71.4
|
2 13/16
|
9150﹠9450
|
159.5
|
2.37：1
|
|
NC50-70(4 1/2 IF)
|
177.8
|
7
|
57.2
|
2 1/4
|
9150﹠9450
|
164.7
|
2.54：1
|
|
NC50-70(4 1/2 IF)
|
177.8
|
7
|
71.4
|
2 13/16
|
9150﹠9450
|
164.7
|
2.73：1
|
|
NC50-72(4 1/2 IF)
|
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 5/8 REG
|
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 5/8 REG
|
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
|
10
|
76.2
|
3
|
9150﹠9450
|
237.3
|
2.81：1
|
|
8 5/8 REG
|
279.4
|
11
|
76.2
|
3
|
9150﹠9450
|
266.7
|
2.84：1
|
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