News - Learn More About Oil Casing: Uses, Differences From API pipes, and Features

Learn More About Oil Casing: Uses, Differences From API pipes, and Features

In the huge system of the oil industry, oil casing plays a vital role. It is a Steel Pipe used to support the well wall of oil and gas wells. It is the key to ensure the smooth drilling process and the normal operation of the oil well after completion. Each well requires multiple layers of casing due to different drilling depths and geological conditions. After the casing is lowered into the well, cementing is required. Unlike oil pipes and drill pipes, it is a one-time consumable material, and its consumption accounts for more than 70% of all oil well pipes. According to usage, oil casing can be divided into guide pipes, surface casings, technical casings, and oil layer casings.

Many people often confuse oil casing with API Pipe, but there are obvious differences between the two. API pipe is a type of pipe under the operating specifications compiled and published by the American Petroleum Institute, covering a wide range, including a variety of pipeline products used in the oil industry. Oil casing is a specific large-diameter pipe that is specially used to fix the wall or wellbore of oil and gas wells. Simply put, API pipe is a standard, and oil casing is a pipe produced based on this standard and has a specific purpose.

Oil casing has many significant characteristics. From the perspective of strength, it can be divided into different steel grades according to the strength of the steel itself, such as J55, K55, N80, L80, C90, T95, P110, Q125, V150, etc., to adapt to different well conditions and well depths. In areas with complex geological conditions, the casing is required to have good anti-collapse performance, be able to withstand the pressure of the surrounding rock formations, and prevent the casing from deformation and damage. In an environment with corrosion risks, the casing must have corrosion resistance to avoid thinning of the pipe wall and reduction of strength due to corrosion, which in turn affects the normal operation and service life of the oil well.

Oil casing occupies an irreplaceable position in oil production. Its unique use, difference from API pipes, and its own characteristics are all important factors to ensure efficient and safe operation of the oil industry.