Common drill collar sizes are listed in the table below. These products are manufactured according to API specifications, including API 7/7-1 and API RP7G where applicable. Customization options are available to meet specific requirements, such as enhanced features and proprietary connections from leading manufacturers.
The following table provides detailed specifications for various types of drill collars:
These drill collars are designed for high-performance drilling operations, ensuring durability, strength, and reliability under demanding conditions. The standard features include API-compliant connections and protective measures to ensure safe handling and long service life. Additional options are available to tailor the product to specific applications, making them a versatile choice for oil and gas drilling projects.
| Drill Collar Connection | Drill Collar Diameter (in) | Bore Diameter (in) | Length (ft) | Linear Weight (Approx.) (lb/ft) | Displacement (Open End) (US gal/ft) | Bending Strength Ratio |
| NC 23-31 | 3-1/8 | 1-1/4 | 30 | 22.00 | 0.337 | 2.57:1 |
| NC 26-35 (2-3/8 IF) | 3-1/2 | 1-1/2 | 30 | 26.70 | 0.408 | 2.42:1 |
| NC 31-41 (2-7/8 IF) | 4-1/8 | 2 | 30 or 31 | 33.65 | 0.515 | 2.43:1 |
| NC35-47 | 4-3/4 | 2 | 30 or 31 | 46.81 | 0.716 | 2.58:1 |
| NC 38-50 (3-1/2 IF) | 5 | 2-1/4 | 30 or 31 | 53.29 | 0.815 | 2.38:1 |
| NC 44-60 | 6 | 2-1/4 | 30 or 31 | 82.61 | 1.264 | 2.49:1 |
| NC 44-60 | 6 | 2-13/16 | 30 or 31 | 75.90 | 1.161 | 2.84:1 |
| NC 44-62 | 6-1/4 | 2-1/4 | 30 or 31 | 90.52 | 1.385 | 2.91:1 |
| NC 46 -62 (4IF) | 6-1/4 | 2-13/16 | 30 or 31 | 83.81 | 1.282 | 2.63:1 |
| NC 46 -65 (4IF) | 6-1/2 | 2-1/4 | 30 or 31 | 99.52 | 1.522 | 2.76:1 |
| NC 46-65 (4IF) | 6-1/2 | 2-13/16 | 30 or 31 | 92.81 | 1.420 | 3.05:1 |
| NC 46-67 (4IF) | 6-3/4 | 2-1/4 | 30 or 31 | 108.52 | 1.600 | 3.18:1 |
| NC 50-70 (4IF) | 7 | 2-1/4 | 30 or 31 | 117.52 | 1.798 | 2.54:1 |
| NC 50 -70 (4IF) | 7 | 2-13/16 | 30 or 31 | 110.77 | 1.694 | 2.73:1 |
| NC 50-72 (4IF) | 7-1/4 | 2-13/16 | 30 or 31 | 119.81 | 1.833 | 3.12:1 |
| NC 56-77 | 7-3/4 | 2-13/16 | 30 or 31 | 139.90 | 2.140 | 2.70:1 |
| NC 56-80 | 8 | 2-13/16 | 30 or 31 | 150.81 | 2.307 | 3.02:1 |
| 6-5/8 REG | 8-1/4 | 2-13/16 | 30 or 31 | 161.81 | 2.472 | 2.93:1 |
| NC 61-90 | 9 | 2-13/16 | 30 or 31 | 195.81 | 2.995 | 3.17:1 |
| 7-5/8 REG | 9-1/2 | 3 | 30 or 31 | 217.00 | 3.319 | 2.81:1 |
| NC 70 -97 | 9-3/4 | 3 | 30 or 31 | 230.00 | 3.518 | 2.57:1 |
| NC 70-100 | 10 | 3 | 30 or 31 | 242.97 | 3.717 | 2.81:1 |
| 8-5/8 REG | 11 | 3 | 30 or 31 | 299.00 | 4.574 | 2.84:1 |
| Standard Features |
API Boreback Box Connection API stress relieve groove pin connection Cold Rolling Thread roots Phosphate coated connections |
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| Options |
Spiral grooved or Non-Spiral (Slick Type) Type of Hardband and Hardband configuration Elevator and Slip recesses or Slip Recess only Other type of connections to meet specific needs |
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| Protection |
Standard Pressed Steel Thread Protectors. Cast Steel Lifting Bail Thread Protectors upon request. |
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| Mill Test Certificates |
Issued in accordance with API 7/7-1 and API RP7G specifications. Third Party Inspection can be performed on request at buyer’s care and expense. |
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