Drill Collars Specifications

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.

Drill collars come in a variety of sizes and configurations, each designed for different drilling applications. The following table outlines key specifications for various standard sizes.

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.
These drill collars are engineered for high performance and durability in demanding drilling environments. They are suitable for a wide range of oil and gas operations, ensuring reliable performance under extreme conditions. Whether you need standard or custom configurations, our products are built to meet the highest industry standards.

TItanium Rods Anode

Titanium Rods Anode,Titanium Anode Rod,Customization Titanium Anode Probel,Electrolytic Synthesis Titanium Anode Probel

Baoji Qiyuexin Metal Material Co., Ltd. , https://www.qyxtitanium.com