Performance of oil casing pipe

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

　　API 5L N80 Oil Casing Pipe 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 casing itself is damaged for some reason, the whole well can be reduced or even scrapped.

　　According to the strength of steel casing 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.