ASTM steel pipes can be divided into different steel grades according to the strength of the steel itself, namely J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Different well conditions and well depths require different steel grades. In corrosive environments, the casing itself is also required to have corrosion resistance. API seamless steel pipes are also required to have anti-squeeze performance in places with complex geological conditions. The pumping pipe mainly transports oil and gas from the bottom of the oil well to the ground.
There are three specified lengths for API oil casing: R-1 is 4.88~7.62m, R-2 is 7.62~10.36m, and R-3 is 10.36m to longer. It is mainly used for drilling oil and gas wells and transporting oil and gas. It includes oil drilling pipes, oil casings, and pumping pipes. Oil drill pipe is mainly used to connect drill collar and drill bit and transmit drilling power. Oil casing is mainly used to support the well wall during drilling and after completion to ensure the normal operation of the drilling process and the entire oil well after completion.
Oil casing is the lifeline to maintain the operation of oil wells. Due to different geological conditions, the stress state downhole is complex, and the combined effects of tension, compression, bending and torsion stress act on the pipe body, which puts higher requirements on the quality of the casing itself. Once the casing itself is damaged for some reason, it may lead to a reduction in production of the entire well or even scrapping.
Carbon steel oil casing
