What kind of materials are petroleum casing made of?

There are many different materials of oil casing, basic carbon steel, J55, L80, P110 and other special materials such as 3 cr, 9 cr, 13 cr, 22 cr, etc., mainly carbon dioxide resistant and known as hydrogen sulfide resistant materials such as 90 SS, 95 ss, etc. In addition, higher grade and nichrome alloy pipes are used depending on the manufacturer. Depending on the manufacturer, different numbers and special needs are also used, for example, material extrusion resistance, some manufacturers will increase TT to indicate extrusion resistance.

Oil casing is a steel pipe used to support the wall of an oil and gas well to ensure proper operation of the entire well after completion.
Depending on the drilling depth and geological conditions, several layers of casing should be used in each well. Cementing is used to cement the well after casing is placed. It is different from tubing and drill pipe and cannot be reused. It is a one-time consumption material.
Therefore, the consumption of casing accounts for more than 70% of all oil well pipelines.
According to the usage, oil casing can be divided into:conduit casing, surface casing, technical casing and reservoir casing.