Pipeline Pull-Back Load Analysis by Continuous Beam Theory

Pipeline pull-back load is an important basis for selecting power and checking capability of drilling equipment. In this paper, mechanical models of the pipeline hoisting outside and pulling inside the hole are established by the continuous beam theory, and relationships among various parameters are analyzed in the process of pull-back pipeline. The results show that there is a linear relationship between the lifting height of basket and the entry angle of hole. During the construction of the hoisting pipeline, the bending moment and shearing force of the basket position near the hole are larger, so the strength check of the pipeline only needs to do at this position. There is a linear relationship between the lifting height of the basket and the length of spanning pipeline. The lifting load and axial force of the pipeline vary linearly. The pull-back load of the pipeline varies curve in the arc segment of the trajectory. The pipeline pull-back load varies linearly in linear segment of trajectory.