Oil Spiral drill collar 1.OD : 3 1/8''---11'' 2.Length: 10'--31' 3.Material:AISI 4145 H / 4145H Mod
Drill collars are manufactured from AISI 4142H-4145H or 36CrNiMo4 modified steel.
drill collar mainly used between the dill pipe and drill head and connected by conversion connector so that they can provide the pressure .
| 1 | 2 | 3 | 4 | 5 | 6 |
Drill collar No.and connection a b | D | d | L | D F | bending strength ratio |
mm | mm | m | mm | BSR e | |
| ±152.4mm d | ±0.4 |
| ||
NC23-31 | 79.4 | 31.8 | 9.14 | 76.2 | 2.57:1 |
NC26-35 | 88.9 | 38.1 | 9.14 | 82.9 | 2.42:1 |
NC31-41 | 104.8 | 50.8 | 9.14 /9.45 | 100.4 | 2.43:1 |
NC35-47 | 120.6 | 50.8 | 9.14 /9.45 | 114.7 | 2.58:1 |
NC38-50 | 127.0 | 57.2 | 9.14 / 9.45 | 121.0 | 2.38:1 |
NC44-60 | 152.4 | 57.2 | 9.14 /9.45 | 144.5 | 2.49:1 |
NC44-60 | 152.4 | 71.4 | 9.14 /9.45 | 144.5 | 2.84:1 |
NC44-62 | 158.8 | 57.2 | 9.14 /9.45 | 149.2 | 2.91:1 |
NC46-62 | 158.8 | 71.4 | 9.14 /9.45 | 150.0 | 2.63:1 |
NC46-65 | 165.1 | 57.2 | 9.14 /9.45 | 154.8 | 2.76:1 |
NC46-65 | 165.1 | 71.4 | 9.14/9.45 | 154.8 | 3.05:1 |
NC46-67 | 171.4 | 57.2 | 9.14 / 9.45 | 159.5 | 3.18:1 |
NC50-70 | 177.8 | 57.2 | 9.14/9.45 | 164.7 | 2.54:1 |
NC50-70 | 177.8 | 71.4 | 9.14 /9.45 | 164.7 | 2.73:1 |
NC50-72 | 184.2 | 71.4 | 9.14/9.45 | 169.5 | 3.12:1 |
NC56-77 | 196.8 | 71.4 | 9.14 / 9.45 | 185.3 | 2.70:1 |
NC56-80 | 203.2 | 71.4 | 9.14 / 9.45 | 190.1 | 3.02:1 |
6 5/8 REG | 209.6 | 71.4 | 9.14 / 9.45 | 195.6 | 2.93:1 |
NC61-90 | 228.6 | 71.4 | 9.14/ 9.45 | 212.7 | 3.17:1 |
7 5/8 REG | 241.3 | 76.2 | 9.14 / 9.45 | 223.8 | 2.81:1 |
NC70-97 | 247.6 | 76.2 | 9.14 /9.45 | 232.6 | 2.57:1 |
NC70 100 | 254.0 | 76.2 | 9.14 / 9.45 | 237.3 | 2.81:1 |
8 5/8 REG | 279.4 | 76.2 | 9.14 / 9.45 | 266.7 | 2.84:1 |
| NC50-67 | 171.5 | 71.4 | 9.14 or 9.45 | 159.5 | 2.37:1 |
Jenny-region marketing manager
mob:0086-13675466243
Oil Spiral drill collar
