Description
1. Raw Material & Low-Temperature Impact Performance
We prioritize TPCO steel tubes for drill pipe production as required by clients. The minimum wall thickness of steel tubes reaches 95% WT, complying with PSL-3 specification. After upset forging and heat treatment, the average Charpy impact energy of UTG at -20°C exceeds 100J, and single impact energy is higher than 80J.
The length and radius of upset transition zones fully satisfy NS-1 standards: internal transition MIU > 100mm, transition arc R300mm, which effectively reduces stress concentration and extends service life under complex downhole working conditions.
2. Advanced Pipe Body Upsetting Technology
We adopt large-tonnage rapid hydraulic upsetting machines for pipe end thickening. The heavy forging force enables one-time double upset forming, avoiding repeated heating & cooling that leads to coarse grain structures. Fewer heating cycles lower decarburization risk on upset sections and prevent premature pipe failure caused by piercing at upset positions.
Fast upset forging refines metal grains significantly. Even after heating and forging, the pipe upset ends maintain excellent mechanical properties. Post heat treatment tests verify that the mechanical indicators of upset sections are consistent with the parent pipe body.
Large-tonnage hydraulic upsetting ensures the mechanical performance of thickened sections matches the base pipe perfectly, providing an optimal solution for drill pipe manufacturing and guaranteeing stable mechanical performance of weld joints.
3. Uniform Heat Treatment & Full-Length Descaling
We adopt advanced regenerative combustion walking beam furnaces to guarantee uniform heating temperature of pipe bodies. Side-opening furnace doors keep consistent temperature during pipe discharging, achieving identical cooling speed in quenching procedures.
After heat treatment, pipe bodies feature dense microstructure, uniform mechanical properties and high impact toughness. All pipes go through full-length descaling after quenching, delivering smooth surface finish, improving subsequent non-destructive testing accuracy and fully securing product quality.
4. Professional Design & Calculation System
We apply dedicated drill string design software to calculate structural parameters of pipe bodies and tool joints, conducting automatic verification to ensure theoretical design parameters match practical drilling requirements.
5. Tool Joint Production & Global Qualification
As one of China’s earliest, largest and highest-volume exporters of drill pipe joints, all our tool joints are manufactured per API 5DP PSL-3 or customized client standards, with an annual production capacity of 300,000 pairs and 120,000 pairs for direct export.
Our long-term global partners include NOV Grantprideco (Jiangsu, Tianjin, Indonesia, Abu Dhabi factories), TSC, Mitsui, Command Energy, Superior, P-Tech and other international enterprises. Our products have passed official API audit and NS-1 certification.
Licensed High-Strength Thread Series
- NOV Grantprideco: H-Series, GPDS, HT, XT
- Command Energy Services: CDS, CET
- PTECH: Ptech Series
- Drill String Solutions: MT Thread
- JSH Premium Threads: JSHDS, JSHHT, JSHET
All tool joints are processed via full-automatic vacuum quenching & tempering furnaces for stable and consistent mechanical properties.
6. Precision Friction Welding & Strict Weld Control
Friction welding stations adopt the latest MTI320BX / 400BX welding systems from the United States. Every weld joint is traceable with unique serial numbers of matched pipe bodies and complete performance parameter records.
In accordance with NS-1 specifications, weld loss is strictly controlled within ±10%. Stable welding parameters and post-weld heat treatment ensure excellent mechanical performance of all welding zones.
