N80Q 7 "airtight buckle

Petroleum specific pipes are mainly used for drilling oil and gas wells and transporting oil and gas. It includes oil drill pipes, oil casing, and oil extraction pipes. Petroleum drill pipes are mainly used to connect drill collars and drill bits and transmit drilling power. Oil 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 extraction pipe mainly transports the oil and gas from the bottom of the oil well to the surface.

Oil casing is the lifeline that maintains the operation of oil wells. Due to different geological conditions, the underground stress state is complex, and the comprehensive effects of tensile, compressive, bending, and torsional stresses act on the pipe body, which puts high demands on 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 anti-corrosion properties. In areas with complex geological conditions, casing is also required to have anti collapse performance.