Simulation Analysis and Test of the Thread Joint of High Strength Directional Drill Pipe with Large Through Hole

Abstract

Abstract According to the requirements of the directional drilling, the Φ89*3000 type directional drill pipe with high strength and large through hole is designed. The pre-tightening force and axial force acting on the threaded joint of the drill pipe are analysed theoretically, and the finite element analysis model of the screw thread joint is established. According to the three working conditions of directional drill pipe, the stress conditions of threaded joints under different working conditions are simulated respectively. Based on the simulation results, the optimization measures of threaded joints are put forward, the design of threaded joint structure is improved, and the structure type and parameters of threaded joint are adjusted. Finally, the performance test and industrial test of high-strength directional drill pipe with large hole are carried out to verify the rationality of the improved design of drill pipe. The new directional drilling technology of “replacing tunnel with hole” is put forward innovatively, which promotes the popularization and application of directional drilling technology in coal mine gas control and contributes to coal mine gas control.