Different types of casings used in the oil extraction process:
Surface oil casing: Protects drilling from contamination by shallow water and gas layers, supports wellhead equipment, and maintains the weight of other layers of casing.
Technical oil casing: Separate the pressure at different levels to ensure normal flow of drilling fluid and protect production casing. Install anti burst devices, leak prevention devices, and tail pipes in the drilling.
Oil casing: Exporting oil and natural gas from underground reservoirs. Used to protect drilling and layer the drilling mud. When producing oil casing, the outer diameter is usually 114.3 millimeters to 508 millimeters.
The types and packaging of petroleum casing are divided into two types according to SY/T6194-96 "Petroleum casing": short threaded casing and its coupling, and long threaded casing and its coupling.