What is casing pipe for oil well drilling?

Editor:Zhejiang Hetai New Material Co. LTD │ Time:2023-05-12 

What is a casing pipe?

Petroleum drilling is one of the essential industries in modern society. In order to smoothly extract oil or natural gas from underground, casing pipe for oil well drilling play an extremely important role in the petroleum drilling process. A casing pipe is a type of pipe used to support and reinforce the wellbore, preventing collapse of the borehole. The casing is placed inside the wellbore, forming a multilayer structure to ensure stability and safety during drilling. The casing not only serves as a support but also acts as a barrier to isolate oil or gas from surrounding rock formations and prevent leaks.

Types of casing pipes:

Casing pipes can be classified into different types based on their diameter, length, thickness, and material. In general, there are three types of casing pipes manufactured by fiberglass epoxy resin tube manufacturers in China: surface casing, intermediate casing, and production casing. Each type of casing serves a different purpose. Here's a brief overview of the differences:

1. Surface casing

Surface casing is the outermost layer of casing closest to the surface and is typically made of low-strength steel or plastic. Its function is to protect shallow soil and water sources around the wellbore and prevent contamination and erosion.

2. Intermediate casing

Intermediate casing is located between the surface casing and production casing and is a thicker and more durable casing. It is mainly used to support the wellbore and isolate different rock formations to reduce the risk of oil or gas leakage.

3. Production casing

Production casing is the casing used in deeper underground layers. As it needs to withstand extreme conditions such as higher temperatures, pressures, and corrosiveness, production casing is typically made of high-strength alloy materials. Its function is to support the wellbore and maintain its stability.

Advantages of casing pipes:

Casing pipes are essential and indispensable for every construction project, not only improving safety but also reducing environmental risks and increasing oil recovery rates. Here are three advantages of casing pipes:

1. Improved safety: Casing pipes can effectively support and reinforce the wellbore, preventing collapse and improving drilling safety and stability, avoiding accidents.

2. Reduced environmental risks: By isolating the oil or gas layer from surrounding rock formations, casing pipes reduce the risk of leaks and pollution. This helps protect the earth's environment and ecosystem.

3. Increased oil recovery rates: Casing pipes can increase oil recovery rates by encasing oil or gas layers and directing them to the surface. This improves efficiency in oil production and reduces energy waste.

4. Ensured drilling continuity: The use of casing pipes ensures drilling continuity by preventing borehole collapse and maintaining its stability. This helps avoid interruptions and delays during drilling and improves production efficiency.

Casing pipes are not just simple barriers between oil or gas and rock formations; they are composed of a multilayer structure to ensure stability and safety during drilling. Each layer has different specifications to adapt to different geological conditions and environmental requirements while also being durable enough to withstand harsh conditions such as high temperatures, pressures, and corrosiveness. Therefore, they are usually made of high-strength epoxy fiberglass materials to ensure durability and stability.


Casing pipes are an indispensable part of the petroleum drilling process, supporting and reinforcing the wellbore and preventing collapse. They have advantages such as improved safety, reduced environmental risks, increased oil recovery rates, ensured drilling continuity, and features such as durability, multilayer structure, and regular maintenance. With the continuous advancement of technology and the growing demand for energy, the importance of casing pipes will become more and more prominent.