Definition of oil casing in energy projects

Oil-specific pipes are mainly used for drilling oil and gas wells and transporting oil and gas. It includes oil drill pipes, oil casing, and pumping pipes. Oil drill pipes are mainly used to connect drill collars and drill bits and transmit drilling power. Oil casing is mainly used to support the well wall during drilling and after completion to ensure the drilling process and the normal operation of the entire oil well after completion. Pumping pipes mainly transport oil and gas from the bottom of the oil well to the ground.

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.

According to the strength of the steel itself, the casing can be divided into different steel grades, 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. In areas with complex geological conditions, the casing is also required to have anti-collapse performance.