Casing is a large-diameter pipe that plays a role in fixing oil or natural gas well walls or boreholes. 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 drilling mud to facilitate drilling and production. Different types of casing used in oil extraction:
Surface oil casing
-Protect the well from being contaminated by shallow water and shallow gas layers,
-Support wellhead equipment and maintain other layer weights of casing.
Technical oil casing
-Separate the pressure on different levels so that the drilling fluid can flow properly and protect the production casing.
-To install anti-burst devices, leak-proof devices and tail pipes in the well.
Oil casing
-Export oil and gas from reservoirs below the surface.
-It is used to protect drilling and to layer drilling mud.
When producing oil casing, the outer diameter is usually 114.3 mm to 508 mm.