Working principle of spiral seam submerged arc welded steel pipe

the spiral seam submerged arc welded steel pipe is rotated and drilled and begins to enter the soft formation. under the action of the three-cone wheel, the drill bit first produces elastic shear deformation of the formation and then is removed under the pressure of the three-cone wheel. in the simulation environment, soft soil is a homogeneous clay, and the formation and cracks in the soil are not considered. horizontal directional drilling is performed in abrupt formations that are in random dynamic contact with the roller cone bit. friction occurs when the cone comes into contact with the formation. the impact force causes the spiral seam submerged arc welded steel pipe to vibrate. when the tritone bit moves from soft to hard formations, it will inevitably produce large lateral vibrations and up-and-down vibrations.

when the drilling speed is 0.008m/s and the drill bit rotation speed is 2 rad/s, the pseudo strain energy curve during the advancement of the roller cone bit mainly includes viscosity and elasticity. however, since the viscous term usually dominates, most of the energy converted into pseudo-strain energy is irreversible. the deformation energy of spiral seam submerged arc welded steel pipe is the main energy consumed to control hourglass deformation. if the pseudo strain energy is too high, it means that the strain energy controlling the hourglass deformation is too large, and the mesh should be refined or modified. to reduce excessive spurious strain energy. the pseudo strain energy mutation in this model mainly occurs when the drill bit enters the soft soil layer and the roller cone bit passes through the abrupt formation interface. the greater the hardness of the formation, the greater the pseudo strain energy of the drill bit entering the formation. simulate the drilling process of spiral welded pipe in sudden formation and predict the changes in drill bit drilling trajectory.