Research on Improving the Load Capacity of Expandable Liner Hanger

In order to increase the hanging force and improve the performance of lubrication between expansion cone and body of the expandable liner hanger,the expansion structure was redesigned.For example,metal was inlayed into the outer wall of expansion body to increase its hanging force; solid lubrication coat was applied on the inner surface of expansion body and the surface of expansion cone to improve the lubrication performance and decrease the expansion force.The expansion experiment suggested that the hanging force of expansion body with single inlayed metal was up to 200 kN,which was 3 times that without inlayed metal,and the expansion force with solid lubrication coat was 268 kN,a decrease by 21%.The research showed that these two methods were effective to improve the expansion and hanging performances of the expandable liner hanger.