Oil casing is a steel pipe used to support the wall of oil and gas Wells to ensure the normal operation of the drilling process and the entire well after completion. Each well uses several layers of casing depending on the drilling depth and geology. Casing after the well to use cement, it is different from tubing, drill pipe, can not be reused, belongs to a one-time consumption of materials. Therefore, casing consumption accounts for more than 70% of all oil well pipes.
Casing can be divided into pipe, surface casing, technical casing and oil casing according to the use.
