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High Speed Of Oil Field Drill Collars
**High Speed of Oil Field Drill Collars**
While examining the drill collars used in oil field operations, it's essential to understand their chemical composition and mechanical properties. The table below outlines the chemical composition of the drill collars, focusing on a specific grade.
| Grade | Chemical Composition (%) |
|---------------|--------------------------|
| 4145HMOD | C: 0.42–0.49 |
| | Si: 0.15–0.35 |
| | Mn: 1.00–1.25 |
| | P: ≤0.025 |
| | S: ≤0.025 |
| | Cr: 1.00–1.35 |
| | Mo: 0.30–0.35 |
| | Ni: ≤0.25 |
| | W: ≤0.35 |
| | V: 0.03–0.08 |
**Mechanical Properties of Drill Collars**
The following table details the mechanical properties for different outer diameter ranges:
| Outer Diameter Range (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Brinell Hardness (HB) | Charpy Impact Energy (AkvJ) |
|---------------------------|----------------------|------------------------|----------------|-----------------------|-----------------------------|
| 79.4 – 171.4 | ≥758 | ≥965 | ≥13 | 285–341 | ≥54 or ≥70 |
| 177.8 – 279.4 | ≥689 | ≥930 | ≥13 | 285–341 | ≥54 or ≥70 |
**Drill Collar Specifications**
Here is a detailed breakdown of various drill collar specifications:
| Specification | OD (mm) | ID (mm) | Length (mm) | Chamfer Diameter (mm) | Reference Curved Bending Strength Proportion |
|--------------------|---------|---------|-------------|-----------------------|----------------------------------------------|
| NC23-31 | 79.4 | 31.8 | 9150 | 76.2 | 2.57:1 |
| NC26-35 (2 3/8IF) | 88.9 | 38.1 | 9150 | 82.9 | 2.42:1 |
| NC31-41 (2 7/8IF) | 104.8 | 50.8 | 9150 | 100.4 | 2.43:1 |
| NC35-47 | 120.7 | 50.8 | 9150 | 114.7 | 2.58:1 |
| NC38-50 (3 1/2IF) | 127.0 | 57.2 | 9150 or 9450| 121.0 | 2.38:1 |
| NC44-60 | 152.4 | 57.2 | 9150 or 9450| 144.5 | 2.49:1 |
| NC44-62 | 158.8 | 57.2 | 9150 or 9450| 149.2 | 2.91:1 |
| NC44-62 (4IF) | 158.8 | 71.4 | 9150 or 9450| 150.0 | 2.63:1 |
| NC46-65 (4IF) | 165.1 | 57.2 | 9150 or 9450| 154.8 | 2.76:1 |
| NC46-65 (4IF) | 165.1 | 71.4 | 9150 or 9450| 154.8 | 3.05:1 |
| NC46-67 (4IF) | 171.4 | 57.2 | 9150 or 9450| 159.5 | 3.18:1 |
| NC50-67 (4 1/2IF) | 171.4 | 71.4 | 9150 or 9450| 159.5 | 2.37:1 |
| NC50-70 (4 1/2IF) | 177.8 | 57.2 | 9150 or 9450| 164.7 | 2.54:1 |
| NC50-70 (4 1/2IF) | 177.8 | 71.4 | 9150 or 9450| 164.7 | 2.73:1 |
| NC50-72 (4 1/2IF) | 184.2 | 71.4 | 9150 or 9450| 169.5 | 3.12:1 |
| NC50-77 | 196.8 | 71.4 | 9150 or 9450| 185.3 | 2.70:1 |
| NC50-80 | 203.2 | 71.4 | 9150 or 9450| 190.1 | 3.02:1 |
| 6 5/8REG | 209.6 | 71.4 | 9150 or 9450| 195.7 | 2.93:1 |
| NC61-90 | 228.6 | 71.4 | 9150 or 9450| 212.7 | 3.17:1 |
| 7 5/8REG | 241.3 | 76.2 | 9150 or 9450| 223.8 | 2.81:1 |
| NC70-97 | 247.6 | 76.2 | 9150 or 9450| 232.6 | 2.57:1 |
| NC70-100 | 254.0 | 76.2 | 9150 or 9450| 237.3 | 2.81:1 |
| 8 5/8REG | 279.4 | 76.2 | 9150 or 9450| 266.7 | 2.84:1 |
These tables provide critical insights into the performance and durability of drill collars used in oil drilling operations. Proper understanding and selection of these parameters can significantly enhance operational efficiency and safety.