Drill Pipe parameter
Tensile strength: ≥950 MPa
Torsional stiffness: ≥400 kN·m/rad
Fatigue strength: ≥10^7 cycles (ISO 13679)
Dynamic balancing accuracy: G2.5 grade
Quick connection support: Yes
Material: High-strength alloy steel
The drill pipe is the core component of the power transmission system of the raise boring rig, and undertakes the key task of delivering high torque/thrust to the drill bit. LOOKING drill pipe has industry-leading advantages in power transmission efficiency, fatigue resistance and adaptability to extreme working conditions.
Precision forging with high-strength alloy steel ensures stable transmission of high torque/thrust with energy loss less than 3%;
Optimized thread engagement design (API NC50/REG) improves power transmission efficiency and reduces downhole vibration loss.
Stepped wall thickness design: Enhances uniformity of stress distribution and resists fatigue fracture caused by alternating loads;
Surface strengthening treatment: Chrome plating on the inner wall + shot peening on the outer wall, increases wear resistance by 50% and extends replacement cycle.
Anti-drop locking structure: double sealing thread + torque limiting groove, eliminating the risk of loosening underground;
Adaptive rock formation conditions: passed ISO 13679 CAL IV level test, maintaining stability in broken zones/hard rock formations.
Regularly check the thread taper (every 500m of drilling) and calibrate it using a special thread repair tool.
Deep well hard rock formation: choose thickened wall drill pipe (≥19mm) + double shoulder thread (such as DS50);
Highly corrosive formation: use stainless steel lined composite pipe + cathodic protection system;
Large displacement horizontal well: configure high-toughness drill pipe (Charpy impact energy ≥80J) + anti-friction joint.
