The inner diameter seamless pipe is extruded through the double-action forward and reverse extruder imported by SMS, and is equipped with a follow-up needle, which can complete the effect of changing the inner diameter of the same pipe and fill the domestic technical gap. Pipes are widely used in deep-sea drilling projects. The quality of the products produced is good, and the later quality assurance services are timely and effective. They are favored by well-known enterprises at home and abroad.