The oil and gas pipelines are assembled by a single pipe connected one by one. The modern oil and gas pipelines and oil and gas pipelines are made of steel pipes connected by electric welding. The steel pipe has a variety of seamless pipes, spiral seam pipes and straight seam pipes. The seamless pipe is suitable for pipes with a pipe diameter of 529 mm or less, and the spiral seam pipe and the straight seam pipe are suitable for large diameter pipes. The cross-sectional structure of the pipe of the gathering pipeline is complicated by the inner coating-steel pipe-outer insulation layer-insulation (cooling) layer; the simple one is only the steel pipe and the outer insulation layer, while the inner wall coating and the heat preservation (cold insulation) layer are both considered The oil and gas transfer process will be determined.