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Purpose: The main difference between casing and tubing is their purpose. Casing is used to line the wellbore and prevent it from collapsing, while tubing is used to convey fluids such as oil or gas from the reservoir to the surface.
Size: Casing is typically larger in diameter than tubing. Casing is available in a range of sizes, typically from 4 1/2 inches to 20 inches in diameter, while tubing is usually between 1 1/2 inches and 4 1/2 inches in diameter.
Length: Casing is usually longer than tubing, with lengths of up to 40 feet or more. Tubing, on the other hand, is usually between 25 and 30 feet long.
Thickness: Casing is typically thicker than tubing to withstand the weight of the overlying rock and the pressure of the fluids it contains. The thickness of casing can vary depending on the depth and pressure of the well, but it is typically between 0.25 and 1 inch. Tubing, on the other hand, is thinner, with a thickness of between 0.10 and 0.25 inch.
Material: Casing is usually made of steel, with the grade and type of steel chosen based on the conditions in the well. Tubing can be made of steel, plastic, or other materials, depending on the specific application.
Connections: The connections on casing are typically threaded, allowing sections to be screwed together to form a continuous string. Tubing connections can be threaded or welded, depending on the application.
