Product Description of Casing and Tubing
Casing and tubing are the important parts of OCTG products. It is widely used for the drilling wells and transporting the fluid in the energy project.
For the tubing, it is a pipe used for the transportation of crude oil and natural gas from an oil or gas layer to the surface after drilling is complete. Tubing is the conduit through which oil and gas are brought from the producing formations to the field surface facilities for processing. Tubing must be adequately strong to resist loads and deformations associated with production and workovers.
For the casing, it is a series of steel pipes that are run into a drilled oil well to stabilize the well, keep contaminants and water out of the oil stream, and prevent oil from leaching into the groundwater. Casing is installed in layers, in sections of decreasing diameter that are joined together to form casing strings.
What Are The Differences Between Casing and Tubing?
Tubing are pipes through which the oil or gas is transported from the wellbore. Tubing segments are generally around 30 ft (9 m) long with a threaded connection on each end. Tubing comply with Specifications on Casing and Tubing (API Spec 5CT), Specifications on Processing, Measuring and Inspecting Casing, Tubing and Threads (API Spec 5B) and other related standards.
Casing is a special tubular product for oil (gas or water) extraction. Casing is particularly exposed to axial tension and internal pressure by the pumped oil or gas emulsion. Casing comply with Specifications on Casing and Tubing (API Spec 5CT), Specifications on Processing, Measuring and Inspecting Casing, Tubing and Threads (API Spec 5B) and other related standards.
Types of Casing and Tubing
| Type | Typical Size | Function |
|---|
| Conductor Casing | 18" – 36" | First string installed; prevents wellbore collapse near surface; isolates shallow groundwater |
| Surface Casing | 10" – 20" (typical 13-3/8") | Protects freshwater zones; supports wellhead and BOP; provides blowout prevention |
| Intermediate Casing | 7" – 13-3/8" | Isolates problematic formations (sloughing shale, lost circulation); allows use of lighter mud; may not be required in all wells |
| Production Casing | 4.5" – 9-5/8" | Final string; provides structural integrity for hydrocarbon production; houses tubing and packers |
Connection of Casing and Tubing
SC / LC / BC are API casing connections: SC for shallow/low-pressure wells, LC for medium-depth wells, BC for deep/deviated/high-pressure wells.
NU / EU / IJ are API tubing connections: NU is non-upset (limited clearance), EU is external upset (most common, 100% efficiency), IJ is integral (flush design).
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