Description
Drill Collar
1.Meeting to API7-1
2.OD:3 1/8″,3 1/2″,4 1/8″,4 3/4″,5″,6″,,6 1/4′,6 1/2″,6 3/4″,7″,7 1/4″,7 3/4″,8″,8 1/4″,9″,10″,11″
3.Length:5″-31″
4.Type: slick drill collar,spiral drill collar,spiral drill collar with elevator groove and slip groove and non-magnetic drill collar
5.Material:ANSI4137 ,4145H,4145HM alloy steel.
| The Main Technical Specification of Drill Collar | ||||
| O.D. | I.D. | Connections | ||
| inch | mm | inch | mm | |
| 4-1/8 | 104.78 | 2
2-1/4 |
50.80
57.15 |
NC31,NC35
NC35 |
| 4-3/4 | 120.65 | 2
2-1/4 |
50.80
57.15 |
NC35,
NC35,NC38(3 1/2IF) |
| 6-1/4 | 158.75 | 2-1/4
2-13/16 |
57.15
71.44 |
NC46(4IF)
NC46(4IF) |
| 6-1/2 | 165.1 | 2-1/4
2-13/16 |
57.15
71.44 |
NC46(4IF)
NC46(4IF) |
| 7 | 177.8 | 2-1/4
2-13/16 |
57.15
71.44 |
NC50(4 1/2IF)
NC50(4 1/2IF) |
| 8 | 203.2 | 2-13/16
3 |
71.44
76.20 |
6 5/8REG
6 5/8REG |
| 9 | 228.6 | 2-13/16
3 |
71.44
76.20 |
7 5/8REG
7 5/8REG |
| 9-1/2 | 241.3 | 3 | 76.20 | 7 5/8REG |
| 10 | 254 | 3 | 76.20 | NC70 |
| 11 | 275.4 | 3 | 76.20 | NC77 |