Mechanical Behavior Analysis And Structure Optimization On Slips And Rubber Of Well Completion Packer

In the practical production, well completion packer may happens sealing failure caused by slip teeth fracture, casing damage due to slips and rubber breakage even falling off. So the paper takes THT well completion packer as the research object to do study on slip and rubber of well completion packer.In this paper, the pure theory analysis and finite element simulation are used to analyze the slip and rubber. Based on the statics theory, the contact stress formula of slip tooth can be obtained, and the results of the finite element analysis show that the contact stress of slip near to the load is larger than that far away the load, and the biting areas focus on the symmetry of slip due to the difference between the inner radial of casing and outer radial of slip. The analysis of the influence factors of slip contact stress shows that when tooth angle α at 75°-80°, tooth inclination angle at 65°-70° and slip wedge angle at 10°-15°,the contact condition of slip will be optimal. In the same way, on the basis of material mechanics and elastic plastic mechanics, the contact stress formula and compression length of rubber during the free deformation and constrain deformation stages can be obtained. And the result of the finite element analysis for rubber indicates that the contact stress of the rubber distributes unevenly along with the axial direction, almost linearly decreasing. According to the study on the influence factors of contact stress of rubber, it can be known when the angle of rubber contact face at 75°-80°, the height of harden rubber is 40-50 mm, while the soft rubber is 50-60 mm, and the loading way is bidirectional, the contact stress of rubber can achieve the best condition.