Features and Benefits
1.A hardness range of 285 to 341 BHN and a Charpy impact value of 40 ft-lbs are guaranteed at evenly distributed 16 points in any sections at room temperature;
2.Connections are completed(phosphate coated)to protect them from the elements after machining and to help prevent galling upon initial make-up;
3.Thread roots are cold rolled on API and H-90 connections;
4.Pressed steel thread protectors are supplied for all drill collar that are equipped with standard connections
Drill collar
Number and connection table | Outside Diameter | Inside Diameter | Length | Bevel | Bending | ||
mm | in | mm | in | ||||
NC23-31 | 79.4 | 3 1/8 | 31.8 | 1 1/2 | 9150 | 76.2 | 2.57:1 |
NC26-35(2 3/8 IF) | 88.9 | 3 1/2 | 38.1 | 1 1/2 | 9150 | 82.9 | 2.42:1 |
NC31-41(2 7/8 IF) | 104.8 | 4 1/8 | 50.8 | 2 | 9150 | 100.4 | 2.43:1 |
NC35-47 | 120.6 | 4 3/4 | 50.8 | 2 | 9150 | 114.7 | 2.58:1 |
NC38-50(31/2IF) | 127 | 5 | 57.2 | 2 1/4 | 9150 | 121 | 2.38:1 |
NC44-60 | 152.4 | 6 | 57.2 | 2 1/4 | 9150 or 9450 | 144.5 | 2.49:1 |
NC44-60 | 152.4 | 6 | 71.4 | 2 13/16 | 9150 or 9450 | 144.5 | 2.84:1 |
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 1/2 | 71.4 | 2 13/16 | 9150 or 9450 | 150 | 2.63:1 |
NC44-65(4IF) | 165.1 | 6 1/2 | 57.2 | 2 1/4 | 9150 or 9450 | 154.8 | 2.76:1 |
NC44-65(4IF) | 165.1 | 6 1/2 | 71.4 | 2 13/16 | 9150 or 9450 | 154.8 | 3.05:1 |
NC44-67(4IF) | 171.4 | 6 3/4 | 57.2 | 2 1/4 | 9150 or 9450 | 159.5 | 3.18:1 |
NC50-67(41/2IF) | 171.4 | 6 3/4 | 71.4 | 2 13/16 | 9150 or 9450 | 159.5 | 2.37:1 |
NC50-70(41/2IF) | 177.8 | 7 | 57.2 | 2 1/4 | 9150 or 9450 | 164.7 | 2.54:1 |
NC50-70(41/2IF) | 177.8 | 7 | 71.4 | 2 13/16 | 9150 or 9450 | 164.7 | 2.73:1 |
NC50-72(41/2IF) | 184.2 | 7 1/4 | 71.4 | 2 13/16 | 9150 or 9450 | 169.5 | 3.12:1 |
NC56-77 | 196.8 | 7 3/4 | 71.4 | 2 13/16 | 9150 or 9450 | 185.3 | 2.70:1 |
NC56-80 | 203.2 | 8 | 71.4 | 2 13/16 | 9150 or 9450 | 190.1 | 3.02:1 |
6 5/8 REG | 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 5/8 REG | 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 | 10 | 76.2 | 3 | 9150 or 9450 | 237.3 | 2.81:1 |
8 5/8 REG | 279.4 | 11 | 76.2 | 3 | 9150 or 9450 | 266.7 | 2.84:1 |
Slips and elevator grooves can be produced upon the customers' requirement. | |||||||
