The difference in appearance between technical casing and surface casing

Overview of technical casing and oil casing

Technical casing and oil casing are both types of casing used in the petroleum industry, but their specific uses are different.
Technical casing is mainly used in drilling, cementing and production processes. Its main function is to support the well wall and prevent well wall collapse and leakage. It can also seal the well head to prevent pressure leakage at the well head. Therefore, technical casing plays a vital role in the oil extraction process.

Oil casing is mainly used to transport oil and gas and prevent well wall collapse. After the oil and gas production is completed, the technical casing is removed, while the oil casing remains in the well pipe as a pipeline for transporting oil, natural gas and other resources. It needs to be resistant to corrosion, withstand high pressure, etc., and it also needs to ensure the smoothness and sealing of the inside of the pipeline.

Structure and materials of technical casing and oil casing
There are also significant differences in structure and materials between technical casing and oil casing.
The structure of technical casing is more complex. Generally speaking, its structure consists of two parts: the "casing wellhead section" placed in the wellhead and the "casing wellhead section" embedded in it. It also needs to be matched with casing shoes, tail pipes, etc. of various materials. There are many materials for casing, such as steel, titanium alloy, fiberglass, etc. The selection of materials and models should also be based on design factors such as its position in the well pipe and diameter.

Oil casing is relatively simple. It is made of relatively thick steel pipe or fiber material and has stronger corrosion resistance. At the same time, the inner core of oil and casing pipes needs to meet high smoothness and precision to ensure the fluidity and mixing balance of oil and natural gas.

Summarize
Technical casing and oil casing have different uses, but they are both important types of casing used in the petroleum industry. There are obvious differences between the two types of casing in terms of use, structure and material. Understanding the differences and characteristics of the two will be of great help and significance for petroleum industry personnel to master the technology and knowledge of oil extraction and transportation.