Drill collar is mainly used to provide bit weight to drill bit so that drill piipe is in tension. Especially drill collar can keep drill bit centralized and hole tradck by large rigidity. Spiral drill collar is used to reduce contact area with hole so as to avoid efficienty bit stricking from differential pressure. Our drill colars are manufactured as per API spec.7.
|
Drill collar thread type |
OD |
ID |
Length (mm) | ||
|
NC23-31 |
mm |
in |
mm |
in |
|
|
NC26-35（23/8″IF） |
79.4 |
3 1/8 |
31.8 |
11/4 |
9150 |
|
NC31- 41(27/8″IF) |
88.9 |
31/2 |
38.1 |
11/2 |
9150 |
|
NC35-47 |
104.8 |
41/8 |
50.8 |
2 |
9150 |
|
NC38-50(31/2″IF) |
120.7 |
43/4 |
50.8 |
2 |
9150 |
|
NC44-60 |
127.0 |
5 |
57.2 |
21/4 |
9150 |
|
NC44-60 |
152.4 |
6 |
57.2 |
21/4 |
9150 (or) 9450 |
|
NC44-62 |
152.4 |
6 |
71.4 |
2 13/16 |
9150 (or) 9450 |
|
NC46-62(4″IF) |
158.8 |
61/4 |
57.2 |
21/4 |
9150 (or) 9450 |
|
NC46-65(4″IF) |
158.8 |
61/4 |
71.4 |
2 13/16 |
9150 (or) 9450 |
|
NC46-67(4″IF) |
165.1 |
61/2 |
57.2 |
2 13/16 |
9150 (or) 9450 |
|
N50-67(4 1/2″IF) |
165.1 |
61/2 |
71.4 |
2 13/16 |
9150 (or) 9450 |
|
NC50-70(4 1/2″IF) |
171.4 |
63/4 |
57.2 |
2 13/16 |
9150 (or) 9450 |
|
NC50-70(4 1/2″IF) |
171.4 |
63/4 |
71.4 |
2 13/16 |
9150 (or) 9450 |
|
NC50-72(4 1/2″IF) |
177.8 |
7 |
57.2 |
2 1/4 |
9150 (or) 9450 |
|
NC50-70(4 1/2″IF) |
177.8 |
7 |
71.4 |
2 13/16 |
9150 (or) 9450 |
|
NC50-72(4 1/2″IF) |
184.2 |
71/4 |
71.4 |
2 13/16 |
9150 (or) 9450 |
|
NC56-77 |
196.8 |
73/4 |
71.4 |
2 13/16 |
9150 (or) 9450 |
|
NC56-80 |
203.2 |
8 |
71.4 |
2 13/16 |
9150 (or) 9450 |
|
6 5/8″REG |
209.6 |
81/4 |
71.4 |
2 13/16 |
9150 (or) 9450 |
|
NC61-90 |
228.6 |
9 |
71.4 |
2 13/16 |
9150 (or) 9450 |
|
7 5/8″REG |
241.3 |
9 1/2 |
76.2 |
3 |
9150 (or) 9450 |
|
NC70-97 |
247.6 |
93/4 |
76.2 |
3 |
9150 (or) 9450 |
|
NC70-100 |
254.0 |
10 |
76.2 |
3 |
9150 (or) 9450 |
|
8 5/8″REG |
279.4 |
11 |
76.2 |
3 |
9150 (or) 9450 |