Drill Collar

Drill Collar

Drill Collar is the basic component in the BHA which provides weight on the bit for drilling and keeps the drillsting in tension.
 
OSUN STEEL Drill Collar has been approved by the NS-1 certification, it is manufactured from 4145H modified quenched and tempered steel, strict metallurgical specifications are followed to insure that full length heat treating produces a consistent maximum depth of hardness.


Features and Benefits

● A hardness range of 285 to 341 BHN and a Charpy impact value of 40 ft-lbs are guaranteed at evenly distributed 16 points in any sections at room temperature;
● Connections are completed(phosphate coated)to protect them from the elements after machining and to help prevent galling upon initial make-up;
● Thread roots are cold rolled on API and H-90 connections;
● Pressed steel thread protectors are supplied for all drill collar that are equipped with standard connections

Specification of Drill Collar
Connect No.
Outer Diameter
Inner Diameter
Length
Bevel 
Typical 
mm
in
mm
in
mm
Diameter
Bending Ratio
NC23-31
79.4
3 1/8
31.8
1 1/2
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
120.6
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
212.6
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
232.8
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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