The difference between tubing and casing

Posted by BAOWI STEEL MANUFACTURING CO.,LTD on March 22nd, 2024

I. Definition and use of tubing:

Tubing is a long, thin steel pipe used to carry oil from the wellhead to the surface.Single-layer tubing is usually small in diameter and is mainly used for gas transmission; The double-layer tubing has a larger diameter and can be widely used in liquid media such as oil and gas transportation.Its main function is to efficiently and safely transport oil from the wellhead to the surface and ensure the stability of the transportation process.

Ⅱ. Definition and use of casing

Casing, also known as casing string, is a steel pipe,It is used to fix well walls and isolate different strata.The casing has multiple structures, and the diameter of the casing in each layer is gradually reduced.This design allows the casing to be placed vertically and can be placed horizontally or at an Angle in curved formations.

1. Fixing the well wall: the casing can be fixed in the well hole by its own strength and the joint action with the wall fixing equipment.

2. Formation isolation: Casing can be isolated from one formation to another to prevent oil and gas mixing between different formations.

Ⅲ. There are significant differences between casing and tubing in use and design.

The specific differences are as follows:

1. Different uses: casing is mainly used to fix well walls and isolate different formations, while tubing is used to transport liquid media such as oil and natural gas.

2.The structure is different: the casing is multi-layered and the diameter of each layer decreases gradually, while the tubing has only a single layer and the diameter is smaller.

3.Different functions: The main function of casing is to secure the wellbore and isolate the formation, while the main function of tubing is to transport oil from the wellhead to the surface.

Summarize:Casing and tubing are two types of steel pipes commonly used in oil drilling.Casing is used to secure the wellbore and isolate different formations, while tubing is used to transport oil from the wellhead to the surface.Although they are all made of steel in theory, there are significant differences in their functions, structures and application fields.

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