Forming Force Calculation and Experimental Study on Hydro-Forming Process of Lined Steel Pipe

Corrosion of oil tubular goods is becoming more and more serious in the exploitation of oil and gas wells, so it is very significant to study new anti-corrosion materials of lined steel pipe. Aiming at the mechanical problem of lined steel pipe hydro-forming, a parametric finite element analysis (FEA) mechanical model is established in this paper to simulate the plastic forming process of lined steel pipe. According to FEA simulation, a method is proposed to calculate forming force of lined steel pipe. Mechanical properties in aspects of bonding force between inner and outer pipes, radial stress-strain ect, were studied. Furthermore, hydro-forming experiments of carbon steel tubing Φ70 × 3.5 mm and stainless steel tubing Φ63 × 1.16 mm are conducted, and deformation laws of inner and outer pipes in the process of lined steel pipe hydro-forming are analyzed by resistance-strain test method. Test results show that forming force calculated by FEA simulation is in good agreement with the experimental data, so the finite element analysis (FEA) model established in this paper is reasonable and can provide theoretical reference for the manufacturing of lined steel pipe.