Petroleum casing pipe
is an important device for petroleum drilling, and its main components also include drill pipes, core tubes and casings, drill collars, and small-diameter drilling steel pipes.
Special oil pipes are mainly used for the drilling of oil and gas wells and the transportation of oil and gas. It includes oil drill pipe, oil casing, and oil pumping pipe. Oil drill pipe is mainly used to connect drill collars and drill bits and transmit drilling power. The oil casing is mainly used to support the well wall during the drilling process and after completion to ensure the progress of the drilling process and the normal operation of the entire well after completion. The sucker pipe firstly transports the oil and gas at the bottom of the oil well to the ground.
Oil casing is the lifeline to keep the oil well running. Due to the different geological conditions, the downhole stress conditions are messy, and the combined action of tensile, compressive, bending and torsion stresses on the pipe body, which puts forward 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 the production of the entire well, or even invalidation.
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 depths have different steel grades. In a corrosive environment, the casing itself is also required to have corrosion resistance. Where the geological conditions are chaotic, the casing is also required to have the ability to resist collapse.