Mechanical Performance Analysis of the Contact Between of BOP Hanging Ram Slips and Oil Pipe

In view of large stress concentration caused by the contact between the BOP (Blowout Preventer) slips and oil pipe, resulting in the damage of oil pipe. On the basis of satisfying the working performance of the hanging ram, it is proposed that the tooth opening angles are 80°,90° and 100°, the tooth crest shapes are pointed, flat and vaulted, and the slip teeth were distributed in straight and fork row, the slip and tubing model is established by 3D software, and simulation analysis is carried out by finite element software. Based on the theory of engineering mechanics, the mechanical model of contact between slip and tubing is established. The feasibility of simulation analysis is verified by analyzing the influence of tooth opening angle on tubing deformation. The total deformation and equivalent stress of slips and tubing are obtained: 1 Compared with 80° slips, the average value of total deformation of slips and tubing models corresponding to 90° and 100° slips decreases by 19.2% and 19.9%, and the average value of equivalent stress decreases by 13.7% and 8.3%. The average value of total deformation corresponding to 100° slips decreases the most, but the value of equivalent stress increases. 2 Compared with pointed slips, the maximum equivalent stress of slips and tubing model corresponding to the vaulted slips decreases by 2.5%, but the total deformation increases by 25.3%; the average values of total deformation and equivalent stress of model corresponding to flat slips are reduced by 29.8% and 12.8%. 3 Compared with straight-row slips, the average value of total deformation and equivalent stress corresponding to fork-row slips are reduced by 43.8% and 51.3%.