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　　The oil pipeline is mainly used for drilling oil and gas well and transporting oil and gas. It includes oil drill pipe, oil casing and oil suction pipe. The oil pipeline is mainly used to connect drill collar and drill bit and transmit drilling power. Oil pipeline is mainly used to support the wellbore during drilling and after completion to ensure the normal operation of the whole oil well. The oil pipeline mainly transfers the oil and gas at the bottom of the oil well to the ground.

　　Oil pipeline is the lifeline of maintaining oil well operation. Due to the different geological conditions, the underground stress state is complex, and the combined action of tensile, compressive, bending and torsional stresses acts on the pipe body, which puts forward higher requirements for the quality of casing itself. Once the API 5CTSchedule 40 carbon steel Oil Pipeline is damaged for some reason, the whole well can be reduced or even scrapped.

　　According to the strength of oil pipeline can be divided into different steel grades, namely J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. The steel grade is different from well condition and well depth. The corrosion resistance of the casing itself is also required under corrosive environment. In the complex geological conditions, the casing is also required to resist collapse.

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