Petroleum casing pipe can be roughly divided into 4 types according to different usage methods: surface casing, intermediate casing, production casing, and drilling casing.
Surface casing is mainly used to suspend and support the subsequent layers of casing through a casing head installed on the top. Another is to isolate the shallow surface water layer from the complex formation in the front to protect the drilling well from pollution by the shallow water layer.
Intermediate casing or technical casing is used to isolate strata of different formation pressures or complicated formations that are easy to collapse and leak.
The production casing is used to protect the production layer, as well as the channels provided for transporting oil and gas from the production layer to the surface.
The drilling casing is used to reduce the load of the drilling rig and the post-casing load during casing and after cementing, saving casing and cement and reducing the cost of cementing.
In industry and field use, petroleum casings show important effects and good performance.
The anticorrosion of petroleum casing is mainly divided into three types: 1. Brush the anticorrosive coating on the outer wall. 2. Brush anti-corrosion coating on the inner wall. 3. Brush the anticorrosive and cooling coating. With the use of oil casings in harsh oil extraction industries such as the polar and marine. It requires the material and structure of petroleum casing, and it must have good nodality, excellent physical properties, stable chemical properties, and a wide range of temperature adaptation. If the oil casing cannot be made, it should be coated with an anticorrosive coating to help him cope with the harsh environment. The coating on the outer wall is used to reduce external corrosion, and the anti-corrosion coating on the inner wall is to reduce friction, reduce corrosion in the pipe, and increase the amount of oil transported. Anticorrosive insulation coating is used to transport crude oil and fuel oil, and reduce the heat emitted from the pipeline to the soil.