Common Anticorrosion Methods for Offshore Oil Casing Pipe

by lvy lee on Oct 9, 2020 Sales 20 Views

The corrosion problem of downhole oil casing pipe in China's offshore oil and gas fields is extremely serious, which seriously affects the service life of downhole oil casing and normal production of oil and gas fields. Through cement sealing, corrosion-resistant alloy pipes, injection of corrosion inhibitors, use of anti-corrosion coating pipes, and enhanced monitoring, the oil casing can be anticorrosive and the normal production of offshore oil and gas fields can be guaranteed.

1. Cement sealing and anticorrosion technology
In the earliest period, it was analyzed that the main cause of casing damage was due to insufficient cement return, which caused the external water layer to not be completely sealed, which caused corrosive gases in the water layer to erode the casing surface and cause corrosion. Therefore, in the 1980s, a strategy of increasing the cement return height was proposed to increase the corrosion resistance of the casing. Through this technology, the degree of casing corrosion is reduced, but it does not completely prevent casing corrosion, so it does not improve the corrosion resistance of the casing from the root cause.

2. Use corrosion resistant alloy pipe
Since 2000, the anticorrosion solution for offshore oil casing has begun to seek solutions from the material to improve the anticorrosion performance of the oil casing, thereby completely solving the corrosion problem of the oil casing. In recent years, through laboratory experiments, under certain temperature and pressure conditions and corrosive gas conditions, 1Cr, 3Cr, 9Cr, 13Cr and other Cr-containing pipes have been evaluated to develop a set of anticorrosive plates suitable for offshore oil and gas field oil casing.

3. Injection of corrosion inhibitor
From the completion process, if the formation contains oily corrosive gas, chemical antiseptics will be added to the well fluid to prevent scale, wax and corrosion. Therefore, it is also a common method at home and abroad to use chemical methods to protect the oil casing. Depending on the conditions of the oil and gas field itself, intermittent or continuous injection of corrosion inhibitors can be used for anticorrosion, and the injection amount also varies according to the corrosion environment of the oil and gas field. Because the addition of corrosion inhibitors has to be continued, on the one hand, the cost is higher, and it will also affect the on-site production.


4. Use anti-corrosion coating tube

For oil casings, anticorrosive coatings are often used at home and abroad to prevent them from infiltrating in corrosive gases. It is also an effective anticorrosion method. Some oil fields use the nitriding process for the internal and external corrosion protection of tubing, which has good abrasion resistance. However, this method of both internal and external wall corrosion will accelerate the corrosion of the inner wall of the casing to a certain extent. At the same time, the nitrided tube is relatively rough and will cause the tubing Yuzaka is more severe than other types of pipes. In addition, some oil and gas fields use epoxy powder coating, titanium nano coatings, epoxy ester phenolic coatings and other methods to prevent corrosion.

5. Strengthen corrosion monitoring
With the advancement of science and technology, more and more methods for monitoring corrosion have been applied: such as anodic excitation technology, radiation activation technology, thin layer activation technology (TLA), optical fiber sensing technology, resonance frequency measurement method, and laser method to determine oxide film. Thickness method, osmotic flaw detection method, potential gradient method, holographic interferometry method, Raman spectroscopy method, etc. Through these different monitoring methods, the corrosion condition of the oil casing can be monitored in all directions, and better methods and methods can be provided for the control of the oil casing corrosion.

Article source:


Permanent Steel Manufacturing Co.,Ltd has been committed to being a major supplier of quality kinds of carbon steel pipe, stainless steel tube, hollow section, numerous types of piping equipments including Bend, Cap, Coupling, Elbow, Reducer, Stub End, Tee, Olet, Joint, Gasket, etc.As a factory,which specializing in the production, processing and sales of various steel pipes and pipe fittings size enterprises, headquartered in Hunan, the production base is located in Shandong and Tianjin. Please refer to:


No comments have been left here yet. Be the first who will do it.

captchaPlease input letters you see on the image.
Click on image to redraw.



Overall Rating:

Latest Comments

thanks bro liked your article got my problem fixed with this on my website teluguheal   also watch my website where i added this method...
You have enough views it's amazing to me in the meanwhile no reason to read it and share it with others. Great!
on Nov 27, 2020 about Familiarize The Process Of SEO
appreciated, thank you for this interesting post.  Hijabs
Thanks for sharing this valuable information. But if you want to hire a professional team of packers and movers in Pune then search online and get the list of top packers and movers in Pune .
Plenty Of Fish Login: Plenty of fish is one of the largest global online dating websites used by the highest number of participants aged between 25-34. The age ranges are divided nearly...

Translate To: