Classification and Corrosion Protection of the Industrial Project Oil Casing

Oil casing can be broadly classified according to its application into: 1. Surface casing; 2. Intermediate casing; 3. Production casing; 4. Drilling casing. Surface casing primarily serves to suspend and support subsequent casing layers via a casing head installed at the top. It also isolates shallow surface water layers from complex formations ahead, protecting the well from contamination. Intermediate casing, or technical casing, is used to isolate formations with different pressures or complex formations prone to collapse and leakage. Production casing protects the production layer and provides a pathway for transporting oil and gas from the production layer to the surface. Drilling liners reduce the load on the drilling rig and the casing itself during and after casing installation and cementing, saving on casing and cement, and reducing cementing costs. Oil casing has demonstrated a significant role and excellent performance in various industries and fields.

Corrosion protection for oil casing mainly includes: 1. Applying an anti-corrosion coating to the outer wall. Second, apply an anti-corrosion coating to the inner wall. Third, apply an anti-corrosion and cooling coating. With the increasing use of oil casing in harsh environments such as polar regions and oceans, the materials and structure of oil casing must possess excellent joint properties, superior physical properties, stable chemical properties, and a wide temperature adaptability range. If the oil casing cannot meet these requirements, it should be coated with an anti-corrosion coating to help it cope with the harsh operating environment. The coating on the outer wall reduces external corrosion. The anti-corrosion coating on the inner wall reduces friction, lowers internal corrosion, and increases oil throughput. The anti-corrosion and heat-insulating coating reduces heat loss from the pipeline to the soil when transporting crude oil and fuel oil.