Classification of oil casing

An oil casing is a large-diameter pipe that fixes the walls or holes of oil and natural gas wells. The casing is inserted into the wellbore and fixed with cement to prevent the wellbore from separating the rock formation and the wellbore from collapsing, and to ensure the circulation of the drilling mud to facilitate drilling and production.

Different Types of Casings Used During Oil Extraction:
Surface oil casing: protects the drilling well from being polluted by shallow water layers and shallow gas layers, supports wellhead equipment, and maintains the weight of other layers of casing.
Technical oil casing: Separate the pressure of different layers so that the drilling fluid can flow normally and protect the production casing. To install anti-burst devices, anti-leakage devices, and liners in drilling.
Reservoir oil casings are used to channel oil and gas from subsurface reservoirs. Used to protect drilling wells and stratify drilling mud.
When the oil casing is produced, the outer diameter is usually 114.3mm to 508mm.