Drill Collars
 Model No: | 40w |
 Solar Power: | 60W |
 Height: | 5 – 7 Meters |
 Lifespan: | 50,000hrs |
- Description
- Technical Data
- China Spiral Drill Collars Specifications:
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The drill collars are made of 4145H modified chromium-molybdenum alloy steel acc.to API Spec.7 and SY/T 5144.All threads can be phosphated, copperized or cold worked. All threads are machined with CNC Lathes-Double-shouldered and special threads. And a special the max diameter of drill collar is 14 inch.
Standard sizes, bores and connections of spiral drill collar
| Connection | OD | ID | L(mm) | Bending strength ratio DF mm | Bending strength ratio | ||
| mm | in | mm | in | ||||
| NC23-31 | 79.4 | 31/8 | 31.8 | 11/4 | 9150 | 76.2 | 2.57:1 |
| NC26-35 | 88.9 | 31/2 | 38.1 | 11/2 | 9150 | 82.9 | 2.42:1 |
| NC31-41 | 104.8 | 41/8 | 50.8 | 2 | 9150or9450 | 100.4 | 2.43:1 |
| NC35-47 | 120.7 | 43/4 | 50.8 | 2 | 9150or9450 | 114.7 | 2.58:1 |
| NC38-50 | 127.0 | 5 | 57.2 | 21/4 | 9150or9450 | 121.0 | 2.38:1 |
| NC44-60 | 152.4 | 6 | 57.2 | 21/4 | 9150or9450 | 144.5 | 2.49:1 |
| NC44-60 | 152.4 | 6 | 71.4 | 213/16 | 9150or9450 | 144.5 | 2.84:1 |
| NC44-62 | 158.8 | 61/4 | 57.2 | 21/4 | 9150or9450 | 149.2 | 2.91:1 |
| NC46-62 | 158.8 | 61/4 | 71.4 | 213/16 | 9150or9450 | 150.0 | 2.63:1 |
| NC46-65 | 165.1 | 61/2 | 57.2 | 21/4 | 9150or9450 | 154.8 | 2.76:1 |
| NC46-65 | 165.1 | 61/2 | 71.4 | 213/16 | 9150or9450 | 154.8 | 3.05:1 |
| NC46-47 | 171.4 | 63/4 | 57.2 | 21/4 | 9150or9450 | 159.5 | 3.18:1 |
| NC50-67 | 171.4 | 63/4 | 71.4 | 213/16 | 9150or9450 | 159.5 | 2.37:1 |
| NC50-70 | 177.8 | 7 | 57.2 | 21/4 | 9150or9450 | 164.7 | 2.54:1 |
| NC50-70 | 177.8 | 7 | 71.4 | 213/16 | 9150or9450 | 164.7 | 2.73:1 |
| NC50-72 | 184.2 | 71/4 | 71.4 | 213/16 | 9150or9450 | 169.5 | 3.12:1 |
| NC56-77 | 196.8 | 73/4 | 71.4 | 213/16 | 9150or9450 | 185.3 | 2.70:1 |
| NC56-80 | 203.2 | 8 | 71.4 | 213/16 | 9150or9450 | 190.1 | 3.02:1 |
| 65/8REG | 209.6 | 81/4 | 71.4 | 213/16 | 9150or9450 | 195.7 | 2.93:1 |
| NC61-90 | 228.6 | 9 | 71.4 | 213/16 | 9150or9450 | 212.7 | 3.17:1 |
| 75/8REG | 241.3 | 91/2 | 76.2 | 3 | 9150or9450 | 223.8 | 2.81:1 |
| NC70-97 | 247.6 | 93/4 | 76.2 | 3 | 9150or9450 | 232.6 | 2.57:1 |
| NC70-100 | 254.0 | 10 | 76.2 | 3 | 9150or9450 | 237.3 | 2.81:1 |
| 85/8REG | 279.4 | 11 | 76.2 | 3 | 9150or9450 | 266.7 | 2.84:1 |
China Spiral Drill Collars Specifications:
◆ Our China Spiral Drill Collars Mechanical Properties
| OD | Min.Yield Strength σt Mpa | Min.Tensile Strength σb Mpa | Min.Elongation % | Brinell hardness HB | Impact value (V-notch CHARPY) AK J | |
| mm | in | |||||
| 88.9-174.6 | 3 1/8-6 3/4 | ≥758 | ≥965 | ≥13 | ≥285 | ≥54 |
| 177.8-279.4 | 7-11 | ≥689 | ≥930 | |||
◆ Dimensional Tolerances Of Spiral Drill Collar
| OD | OD | ID | L mm | Bevel Diameter DF | |
| mm | in | ||||
| ≤88.9 | ≤3 1/2 | +1.2 0 | +1.6 0 | +152.4 | ±0.4 |
| ＞88.9-114.3 | ＞3 1/2-4 1/2 | +1.6 0 | |||
| ＞114.3-139.7 | ＞4 1/2-5 1/2 | +2.0 0 | |||
| ＞139.7-165.1 | ＞5 1/2-6 1/2 | +3.2 0 | |||
| ＞165.1-215.9 | ＞6 1/2-8 1/2 | +4.0 0 | |||
| ＞215.9-241.3 | ＞8 1/2-9 1/2 | +4.8 0 | |||
| ＞241.3 | ＞9 1/2 | +6.4 0 | |||
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