Trenchless drill pipe is mainly used in horizontal directional drilling pipeline crossing and laying engineering. The pipe end thickening conforms to API 5DP standard. The steel grade of the thickened pipe body can reach G105 or S135. The joint is made of rough forging. The quenching and tempering heat treatment after rough machining, the surface nitriding treatment after finishing, and the double shoulder high torsion joint thread adopts the internal and external composite shoulder structure design, and all by precision CNC lathe processing. The tight distance of the thread has been strictly guaranteed