High-Strength 4145H Non-Mag Drill Collar Manufacturing - China Suppliers and Factory for Reliable Drilling Solutions
Drill Collar Testing
- All drill collar materials undergo both chemical composition and mechanical property testing prior to machining.
- Each collar is subject to 100% ultrasonic testing (UT) and magnetic particle inspection (MPI) to detect internal and surface defects.
- Hydrostatic testing is performed to verify pressure integrity and seal performance.
Drill collar Features
- Made from 4145H modified alloy steel and non-magnetic materials, suitable for drill collars, spiral drill collars, lifting subs, and crossover subs.
- Manufactured strictly in accordance with API Spec 7-1, GOST, and NS-1 quality standards.
- TAKELO offers proprietary double shoulder connections and other premium thread designs, with optional cold-rolled thread roots, phosphatizing, nitriding, or tungsten alloy plating to enhance performance and longevity.
- Optional services include various types of hardbanding and internal plastic coating (IPC) based on customer specifications.
- All drill collars are equipped with advanced thread root cold-rolling and optional phosphatizing treatment to enhance fatigue resistance and minimize galling during make-up and breakout cycles. Thread protectors are used throughout handling and transportation.
- Optional surface treatments such as tungsten alloy plating, nitriding, and internal plastic coating (IPC) are available to improve corrosion resistance in high-salinity or sour gas environments, extending service life in harsh drilling conditions.
Drill Pipe Features
| Size | O.D (mm) | I.D. (mm) | Code | Thread | Length (mm) |
|---|---|---|---|---|---|
| 3 1/8 | 79.4 | 31.8 (1-1/4) | NC23-31 | NC23 | 9140 |
| 3 1/2 | 88.9 | 38.1 (1-1/2) | NC26-35 | NC26 | 9140 |
| 4 1/8 | 104.8 | 50.8 (2) | NC31-41 | NC31 | 9140/9450 |
| 4 3/4 | 120.6 | 50.8 (2) | NC35-47 | NC35 | 9140/9450 |
| 5 | 127 | 57.2 (2-1/4) | NC38-50 | NC38 | 9140/9450 |
| 6 | 152.4 | 57.2 (2-1/4) | NC44-60 | NC44 | 9140/9450 |
| 71.4 (2-13/16) | NC44-60 | 9140/9450 | |||
| 6 1/4 | 158.8 | 57.2 (2-1/4) | NC44-62 | NC44 | 9140/9450 |
| 71.4 (2-13/16) | NC46-62 | 9140/9450 | |||
| 6 1/2 | 165.1 | 57.2 (2-1/4) | NC46-65 | NC46 | 9140/9450 |
| 71.4 (2-13/16) | NC46-65 | NC50 | 9140/9450 | ||
| 6 3/4 | 171.4 | 57.2 (2-1/4) | NC46-67 | NC46 | 9140/9450 |
| 7 | 177.8 | 57.2 (2-1/4) | NC50-70 | NC50 | 9140/9450 |
| 71.4 (2-13/16) | NC50-70 | 9140/9450 | |||
| 7 1/4 | 184.2 | 71.4 (2-13/16) | NC50-72 | NC50 | 9140/9450 |
| 7 3/4 | 196.8 | 71.4 (2-13/16) | NC56-77 | NC56 | 9140/9450 |
| 8 | 203.2 | 71.4 (2-13/16) | NC56-80 | NC56/6-5/8REG | 9140/9450 |
| 8 1/4 | 209.6 | 71.4 (2-13/16) | 6-5/8REG | 6-5/8REG | 9140/9450 |
| 9 | 228.6 | 71.4 (2-13/16) | NC61-90 | NC61 | 9140/9450 |
| 9 1/2 | 241.3 | 76.2 (2-13/16) | 7-5/8REG | 7-5/8REG | 9140/9450 |
| 9 3/4 | 247.6 | 76.2 (3) | NC70-97 | NC70 | 9140/9450 |
| 10 | 254 | 76.2 (3) | NC70-100 | NC70 | 9140/9450 |
| 11 | 279.4 | 76.2 (3) | 8-5/8REG | 8-5/8REG | 9140/9450 |
Frequently Asked Questions
What materials are used for TAKELO drill collars?
TAKELO drill collars are manufactured using premium 4145H modified alloy steel and non-magnetic materials, ensuring high tensile strength and durability for various drilling operations.
What testing procedures do your drill collars undergo?
Every drill collar undergoes chemical composition and mechanical property testing before machining. Additionally, they are subjected to 100% ultrasonic testing (UT), magnetic particle inspection (MPI), and hydrostatic testing to guarantee seal performance and pressure integrity.
Which quality standards are followed during manufacturing?
Our manufacturing processes comply strictly with API Spec 7-1, GOST, and NS-1 quality standards to ensure international reliability and safety.
What type of thread treatment options are available?
We offer proprietary double shoulder connections, thread root cold-rolling, and optional surface treatments including phosphatizing, nitriding, and tungsten alloy plating to improve fatigue resistance and prevent galling.
Can you provide custom coatings and hardbanding?
Yes. Depending on customer requirements, we can provide various types of hardbanding and internal plastic coating (IPC) to optimize wear and corrosion resistance in harsh environments.