Definition Of Petroleum Casing

Petroleum specialized pipes are mainly used for drilling oil and gas wells and transporting oil and gas. It includes oil drill pipes, oil casings, and oil extraction pipes. Petroleum drill pipes are mainly used to connect drill collars and drill bits and transmit drilling power. Petroleum casing is mainly used to support the wellbore during drilling and after completion, to ensure the normal operation of the entire oil well during the drilling process and after completion. The oil and gas at the bottom of the oil well are mainly transported to the surface by the oil pumping tube.
Oil casing is the lifeline for maintaining the operation of oil wells. Due to different geological conditions, the stress state underground is complex, and the combined effects of tension, compression, bending, and torsion stress on the casing body pose high requirements for the quality of the casing itself. Once the casing itself is damaged for some reason, it may lead to a reduction in production or even scrapping of the entire well.
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. The steel grade used varies depending on the well condition and depth. In corrosive environments, it is also required that the casing itself has corrosion resistance. In areas with complex geological conditions, it is also required that the casing has anti collapse performance.