Oil casing is a steel pipe used to support the wall of oil and gas wells to ensure the normal operation of the entire oil well during the drilling process and after completion. Each well requires several layers of casing depending on different drilling depths and geological conditions. After the casing is run down, cement cementing is required. It is different from the tubing and drill pipe and cannot be reused. It is a disposable consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes.
Casings can be divided into: conduits, surface casings, technical casings and oil casing casings according to their use.
