7 / 2021-08-11 20:38:55

Study on collapse strength of screen pipe with corrosion defect under external pressure

corrosion defect; screen pipe; hole arrangement parameter; collapse strength; Finite element method

At present, there are few reports on the collapse strength of screen pipe with corrosion defects under external pressure. In this paper, based on ABAQUS finite element software, a parallel screen pipe finite element model with corrosion defect under external pressure is established, and the influence of corrosion defect parameters and perforation parameters on the collapse strength of the screen pipe with corrosion defect is analyzed. The analysis results show that with the corrosion defect close to the middle of the screen pipe, the smaller the collapse strength of corrosive screen tube is; With the increase of corrosion depth and length, the collapse strength of screen pipe with corrosion defects gradually decreases, and the corrosion depth has the greatest influence on the collapse strength of screen pipe. With the change of corrosion parameters, such as corrosion length, corrosion width and corrosion depth, the deformation form of corrosion screen pipe will change. With the increase of hole size, number of circumferential holes and number of axial holes, the collapse strength of corrosive screen pipe decreases gradually. Among them, the hole size and the number of axial holes have great influence on the collapse strength of corroded screen pipe. The results of this study can provide reference for strength evaluation and life prediction of corroded screen pipes.