Analysis of Post-expansion Performance of Expansion Liner Hanger Based on Surface Texture

In view of the application of expandable liner hanger in high-temperature environment of deep and ultra-deep wells, the attenuation of rubber mechanical properties leads to sealing failure, and the leakage of metal sealing surface after bulging of pure metal expansion body, the surface texture technology is used to improve the suspension force and sealing performance of expandable liner hanger body. In this paper, the influence of expansion body material, interference, surface texture structure parameters (depth, width and quantity) on the suspension force and sealing effect of expansion liner hanger is studied. The results show that the surface texture can effectively improve the metal sealing effect of the expansion liner hanger, so as to meet the sealing requirements; when the expansion body material is 20 G, the texture depth is 0.015 mm, the width is 2 mm, the number is 7 and the expansion rate is 7%, the suspension force of the expansion body can reach 394.606 kN, and the sealing requirement can reach 50 MPa.