Application Of Casing

Casing is used to support the walls of oil and gas wells and ensure the normal operation of the entire well after the drilling process is completed. Each well uses multiple layers of casing based on different drilling depths and geological conditions. After the casing is lowered, cement consolidation is required. It is different from oil pipes and drill pipes and cannot be reused. It is a disposable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes.
Special oil pipes are mainly used for drilling oil and gas wells and transporting oil and gas. It includes oil drill pipe, oil casing, oil pipe, etc. Oil drill pipe is mainly used to connect drill collars and drill bits to transmit drilling power. Oil casing is mainly used to support the well wall during the drilling process and after well completion, ensuring the normal operation of the entire well during the drilling process and after well completion. Oil pipelines mainly transport oil and gas from the bottom of oil wells to the surface.
It is the lifeline that keeps oil wells running. Due to different geological conditions and complex underground conditions, the combined effects of tension, compression, bending and torsion stresses act on the pipe body, which places high demands on the quality of the casing itself. Once the casing itself is damaged for some reason, it may result in reduced production or even the entire well being scrapped.
According to the strength of the steel itself, casing can be divided into different steel grades, namely J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc. Depending on the well conditions and well depth, the steel types used are also different. The housing itself also requires corrosion resistance in corrosive environments. In places with complex geological conditions, the casing is also required to have anti-fragmentation properties.

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