... cross section, a large number of channels for transporting fluids, such as steel pipe and ... pipe, petroleum oil pipe, oil and natural gas and so on.Product NameGradeStandardVisual and Dimensional ApplicationCasing ... wells to extract oil or natural gas, oil and gas wells for wellbore casing.LinepipeA,B,X42,X46 ... GB/T9711.232-1240*3-100For oil and gas industry, oxygen, water and oil in the short-distance ...