Method for manufacturing titanium alloy oil well pipe with medium thick wall

The invention provides a method for manufacturing a titanium alloy oil well pipe with the medium thick wall. The method includes the following steps of smelting: titanium sponge is adopted, a vacuum consumable electro-arc furnace is used for smelting the titanium sponge three times, and then a phi 150mm blank pipe is forged and manufactured; heating and hole punching: the blank pipe enters an annular furnace to be heated to 980 DEG C, and the blank pipe is rolled to be a phi 152*16mm tubular billet by adopting a cone puncher; rolling: an Assel unit is adopted for rolling to reduce the thickness of the wall, the wall thickness reducing ratio is 40%, and then the phi 152*9.52mm pipe is acquired; diameter reducing: the pipe enters a reheating furnace to be heated again, then the diameter of the pipe is reduced through a 14-stand diameter reducing machine, the diameter reducing ratio is 41.5%, and then a finished pipe is acquired; thermal treatment: the punched pipe is kept at the temperature of 950-960 DEG C for