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OCTG Casing Complete Buying Guide
Planning to buy OCTG casing in China?
Nuggets of advice here and there will help you make the right choice when it comes to choosing and even buying this equipment.
Let’s have a look at the essential information that you should know when buying OCTG casing for sale in China.
What is OCTG Casing?
An OCTG casing is a pipe-like structure that is used for stabilizing a wellbore. A casing is subjected to tensional force from outside and fluid pressure from inside.
At its position, the casing ensures that the tubing and the wellbore remain stable regardless of the forces that are acting against them.
What is the purpose of OCTG casing?
Is it important to buy and install the OCTG casing? If you ever interacted with wellbores, you must be fully familiar with the importance of casing. There are several reasons why it is an important aspect of any oil extraction process.
As a structural component of the wellbore, casing blocks the wall from caving into the well. This helps to guarantee the safety and productivity of the oil well.
The structural design of the casing inhibits the crossflow of the fluid that is being extracted. This means that the fluid will follow the OCTG tubing without diverting to different directions.
OCTG casing can also act as a pressure regulator. It secures the surface pressure control equipment such as the blowout preventer. This helps the equipment to perform its role effectively especially in the tertiary stages of oil and gas production.
How does OCTG casing work?
OCTG casing is usually manufactured or fabricated in joints or segments whose lengths range between 30 to 40 feet. Different joints are screwed together to form a single long casing of the wellbore.
Each end of the OCTG casing is protected by a thread protector until you finally join the casing to form a single unit. Usually, the female joint ends are connected to the male joint ends to form an air-tight unit that will minimize any chances of leakage. A thread compound can be deployed to facilitate this.
OCTG casing is designed to run from the rig floor to the surface of the wellbore. The casing runs into the well and the casing hanger carries the weight of the casing. Keep in mind the OCTG tubing is also positioned to the inside of the casing.
The exterior side of the casing has centralizers which help to position the casing right at the center of the wellbore. These centralizers are flexible or elastic so that you can easily adjust the position of the casing with ease.
Once the casing is on its desired position, a cement slurry is poured so that it can keep the casing stable. The slurry will harden and the casing will remain in that position permanently unless you will want to uninstall it.
What is the difference between the casing and the drill pipe?
From their physical appearance, you can easily assume that casing for oil exploration is the same as the drill pipe.
In reality, these two are completely different equipment designed to execute different roles in an oil field.
The most conspicuous feature that differentiates casing vs drill pipe is the latter has a drill bit at its end. This bit is designed to cut through rocks during the oil well drilling process.
On the other hand, a casing refers to a casing pipe that houses a tubing inside. The casing basi8cally protects the tubing from the external forces which have the potential of damaging the tubing.
Another physical difference between the casing pipe and the drill is the threads. A drill pipe has too many threads since it will be connected to other equipment. On the other hand, a casing pipe has limited threads.
Apart from the physical appearance, OCTG casing and drill pipe have different manufacturing standards. The drill pipe uses the API 5D standards which outline the drilling performance of the pipe.
On the other hand, OCTG casing uses the APT 5CT standard which basically outlines the quality of the material that is to be used for the casing.
What material is used for OCTG casing?
Given the critical role that OCTG plays in the oil production process, the type of material matters.
Steel is the most preferred material that is used for manufacturing OCTG casing. It has numerous desirable properties that make it an ideal choice of material for this job.
The tensile strength of steel is one of the reasons why OCTG casing manufacturers prefer it to other types of metals. Steel cannot break easily regardless of the external pressure that is applied to it.
Another desirable feature of steel as an OCTG casing material is resistance too corrosion. Steel does not react with many chemicals that are known for causing corrosion.
The choice of steel will guarantee the physical and structural integrity of the OCTG casing.
OCTG Casing manufacturer in China
Equipped with the above information and everything else that you need to know about OCTG casing, it is time to take one last step. Find a reliable OCT casing manufacturer and complete the purchase.
As an experienced OCTG manufacturer, we boast of our capability to design and manufacture premium OCTG casing. Our OCTG casing is proven to meet the maximum standards.
All that you need to do is contact us for the quality OCTG casing in China.
