Pipe material incoming inspection → End upsetting → Integral heat treatment → Pipe straightening → Pipe inspection (leakage, ultrasonic) → Physical and chemical testing → Finished pipe inspection → Cold straightening → Pipe end machining
Tool joint material incoming inspection → Sawing and forging (if necessary) → Joint upsetting → Joint marking → Joint heat treatment → Joint Brinell hardness testing → Physical and chemical testing → Ultrasonic inspection
Make-up/break-out test (if necessary) → Phosphating → Magnetic particle inspection → Joint marking → Cold rolling (if necessary) → Finished joint inspection → Joint thread machining → Joint profile machining
Final joint inspection
Drill pipe & joint end face preparation → Friction welding → Weld post-heating → Weld flash removal → Weld heat treatment (quenching, tempering) → Physical and chemical testing → Weld finishing → Magnetic particle inspection
Ultrasonic inspection → Finished product inspection → Hardbanding (if necessary) → Internal coating (if necessary) → Measuring, weighing and marking → Final inspection → Packaging → Delivery
Strong Anti-Sticking Capability: Featuring a “large annular space, small outer diameter” design, the increased annular space between the rod body and wellbore wall facilitates cuttings removal and drilling fluid circulation, significantly reducing the risk of stuck pipe incidents.
High Drilling Efficiency: The larger bore diameter provides a smoother path for drilling fluid, effectively reducing pressure (hydraulic) loss during circulation. This allows more power to be transmitted to the drill bit, enhancing mechanical drilling speed and overall drilling efficiency.
Suitable for complex wellbore operations: Its gently tapered joints and tubing profile enable easy navigation through narrow, curved well sections, making it particularly suitable for demanding applications such as window sidetracking, extended-reach horizontal wells, and directional drilling where drill string maneuverability is critical.
