1. Surface casing: Install a casing head on the top, and suspend and support subsequent layers of casing through the casing head; isolate the surface shallow water layer and the shallow complex bottom layer, so that the freshwater layer is not polluted by drilling fluid
2. Intermediate casing (technical casing): isolates layers with different formation pressures or complex formations that are prone to collapse and leakage.
3. Production casing: protects the production layer and provides a channel for oil and gas to flow from the production layer to the surface.
4. Drilling liner: Reduce the load on the drilling rig when running casing and the load on the casing head after cementing, while saving a large amount of casing and cement and reducing cementing costs.
Post time: Dec-14-2023