During the drilling and well completion process, sticking often occurs when casing is run into the horizontal section during RIH of casing, and in some extreme cases casing may be tightly stuck. It is much more serious in western Sichuan due to relatively complex geological conditions. Analysis of some typical sticking cases and their causes leads to the following conclusion: there are 2 main types of sticking: sudden sticking and sticking due to increasing resistance; and the relevant improvement measures are put forward.