High Speed Of Oil Field Drill Collars
Chemical composition
|
Grade
|
Chemical composition %
|
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Mo
|
Ni
|
With
|
To the
|
V
|
|
4145HMOD
|
0.42 ～
0.49
|
0.15 ～0.35
|
1.00 ～1.25
|
≤ 0.025
|
≤ 0.025
|
1.00 ～1.35
|
0.30-0.35
|
≤ 0.25
|
≤ 0.35
|
≤ 0.05
|
0.03 ~ 0 . 08
|
Mechanical properties of drill collars
|
Outer diameter
range
|
Yield strength R t
|
Tensile strength R m
|
Elongation A%
|
Brinell hardness HB
|
Charpy impact energy AkvJ
|
|
mm
|
in
|
MPa
|
MPa
|
|
|
|
|
79.4 — 171.4
|
3 1/8 — 6 3/4
|
≥758
|
≥965
|
≥13
|
285 — 341
|
≥54 or ≥70
|
|
177.8 — 279.4
|
7 — 11
|
≥689
|
≥930
|
≥13
|
285 — 341
|
≥54 or ≥70
|
Mechanical properties of drill collars
|
Outer diameter range
|
Yield strength R t
|
Tensile strength R m
|
Elongation A%
|
Brinell hardness HB
|
Charpy impact energy AkvJ
|
|
mm
|
in
|
MPa
|
MPa
|
|
|
|
|
79.4 — 171.4
|
3 1/8 — 6 3/4
|
≥758
|
≥965
|
≥13
|
285 — 341
|
≥54 or ≥70
|
|
177.8 — 279.4
|
7 — 11
|
≥689
|
≥930
|
≥13
|
285 — 341
|
≥54 or ≥70
|
Chemical composition
|
Grade
|
Chemical composition %
|
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Mo
|
Ni
|
With
|
To the
|
V
|
|
4145HMOD
|
0.42 ～
0.49
|
0.15 ～0.35
|
1.00 ～1.25
|
≤ 0.025
|
≤ 0.025
|
1.00 ～1.35
|
0.30-0.35
|
≤ 0.25
|
≤ 0.35
|
≤ 0.05
|
0.03 ~ 0 . 08
|
| Drill collar specifications |
OD |
ID |
Length Length |
Chamfer diameter Champher |
Reference curved Bending strength Proportion |
| mm |
in |
mm |
in |
|
mm |
Intensity ratio |
| NC23-31 |
79.4 |
3 1/8 |
31.8 |
11/4 |
9150 |
76.2 |
2.57:1 |
| NC26-35(2 3/8IF) |
88.9 |
3 1/2 |
38.1 |
11/2 |
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 |
| NC38-50 (3 1 / 2IF) |
127.0 |
5 |
57.2 |
2 1/4 |
9150 or 9450 |
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 |
| NC44-62(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 |
| 6 5/8REG |
209.6 |
8 1/4 |
71.4 |
2 13/16 |
9150 or 9450 |
195.7 |
2.93:1 |
| NC61-90 |
228.6 |
9 |
71.4 |
2 13/16 |
9150 or 9450 |
212.7 |
3.17:1 |
| 7 5/8REG |
241.3 |
9 1/2 |
76.2 |
3 |
9150 or 9450 |
223.8 |
2.81:1 |
| NC70-97 |
247.6 |
9 3/4 |
76.2 |
3 |
9150 or 9450 |
232.6 |
2.57:1 |
| NC70-100 |
254.0 |
10 |
76.2 |
3 |
9150 or 9450 |
237.3 |
2.81:1 |
| 8 5/8REG |
279.4 |
11 |
76.2 |
3 |
9150 or 9450 |
266.7 |
2.84:1 |
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