Expansion pipe type tail pipe hanger

The utility model relates to an expansion pipe type tail pipe hanger, which is applied to oil drilling well completion tail pipe hanging construction. The expansion pipe type tail pipe hanger mainly consists of a feeding joint, a center pipe, a screw nut, a floating valve, a releasing tool, an expansion pipe, a back connection pipe, an expansion cone, a float valve closing sleeve, a drilling rod rubber plug and a releasing propping sleeve, wherein the lower part of the feeding joint is connected with the center pipe through internal screw threads, the lower end of the releasing tube is connected with the upper end of a spline sleeve through splines, the lower end of the spline sleeve is connected with the expansion pipe through screw threads, an annular lug boss is arranged on the outer wall of the expansion wall, the lower end of the expansion pipe is connected with the upper end of the back connection tube, an expansion device assembly is connected with the lower end of the center pipe in the back connection tube, the floating valve closing sleeve is sheathed on the outer wall of a tail pipe rubber plug hanging seat and the screw cap, and the floating valve closing sleeve is connected with the expansion cone, and the floating valve closing sleeve is connected with the screw cap through pins. The metal lug boss is arranged on the outer wall of the expansion pipe, and the hanging and the seating sealing are completed through the interference fit of the metal lug boss and an outer layer sleeve pipe and are not influenced by the gravity and the clamp tile eccentricity like the conventional tail pipe hanger.