Common drill collar sizes are listed in the table below. All 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 additional 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 and are suitable for a wide range of applications. The standard features ensure durability and reliability, while optional upgrades allow for customization based on project-specific needs. Each product undergoes rigorous testing to meet industry standards and is backed by comprehensive documentation for quality assurance.
| 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 |
|||||
| 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 |
|||||
| Protection |
Standard Pressed Steel Thread Protectors. Cast Steel Lifting Bail Thread Protectors upon request. |
|||||
| 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. |
|||||
Coconut Fiber Compress Machine,Coconut Fiber Baling Press Machine,Coconut Fiber Baling Machine,Baler And Compactor
Nantong Sika Machinery Co., Ltd. , https://www.sikamachinery.com