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Help CenterNC23-31 Drill Collar
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Specifications
1.NC23-31 Drill Collar2.Easy operation
3.API standard
4.AISI 4145H modified steel
NC23-31 Drill Collar
1. Drill collars are manufactured from AISI 4145H modified steel, and are supplied in the "as rolled" surface finish condition. Alternative surface finishes are available.
2.Drill collars are trepanned and drifted to API Spec 7-1. Full-length heat-treatment processes ensure that mechanical properties meet or exceed API Spec 7-1 requirements.
3.A hardness range of 285-341, Brinell hardness and Charpy "V" notch minimum impact strength of 40 ft-lb at 70 F are guaranteed one inch below the surface.
The main technical performance and specification for drill collar:
Model of connection |
OD |
ID |
Length mm |
DFmm |
Bending Strength Ratio |
||
|
mm |
in |
mm |
in |
|
|
|
NC23-31 |
79.4 |
3 1/8 |
31.8 |
1 1/4 |
9150 |
76.2 |
2.57:1 |
NC26-35(2 3/8IF) |
88.9 |
3 1/2 |
38.1 |
1 1/2 |
9150 |
82.9 |
2.42:1 |
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 |
NC3850(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 or 9450 |
144.5 |
2.49:1 |
NC44-62 |
158.8 |
6 1/4 |
57.2 |
2 1/4 |
9150 or 9450 |
149.2 |
2.91:1 |
NC46-62(4IF) |
158.8 |
6 1/4 |
71.4 |
2 13/16 |
9150 or 9450 |
150.0 |
2.63:1 |
NC46-65(4IF) |
165.1 |
6 1/2 |
57.2 |
2 1/4 |
9150 or 9450 |
154.8 |
2.76:1 |
NC46-65(4IF) |
165.1 |
6 1/2 |
71.4 |
2 13/16 |
9150 or 9450 |
154.8 |
3.05:1 |
NC46-67(4IF) |
171.4 |
6 3/4 |
57.2 |
2 1/4 |
9150 or 9450 |
159.5 |
3.18:1 |
NC50-67(4 1/2IF) |
171.4 |
6 3/4 |
71.4 |
2 13/16 |
9150 or 9450 |
159.5 |
2.37:1 |
NC50-70(4 1/2IF) |
177.8 |
7 |
57.2 |
2 1/4 |
9150 or 9450 |
164.7 |
2.54:1 |
NC50-70(4 1/2IF) |
177.8 |
7 |
71.4 |
2 13/16 |
9150 or 9450 |
164.7 |
2.73:1 |
NC50-72(4 1/2IF) |
184.2 |
7 1/4 |
71.4 |
2 13/16 |
9150 or 9450 |
169.5 |
3.12:1 |
NC50-77 |
196.8 |
7 3/4 |
71.4 |
2 13/16 |
9150 or 9450 |
185.3 |
2.70:1 |
NC50-80 |
203.2 |
8 |
71.4 |
2 13/16 |
9150 or 9450 |
190.1 |
3.02:1 |
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