1. In the process of oil exploration and development, oil special pipes play a vital role. According to different use environments and requirements, oil pipe buckles can be divided into two categories: ordinary buckles and special buckles.
2. Definition and design purpose
Ordinary oil pipe buckles:
Ordinary oil pipe buckles, such as API STC (short round thread), API LC (long round thread) and API BC (biased ladder thread), are designed according to API standards.
The processing technology of these buckles is relatively simple, the sealing is good, there is a certain connection strength, and the price is cheap, so they are widely used.
Special buckles:
Special buckles, also known as special threaded joints, are a new type of joints designed by manufacturers to overcome the shortcomings of API joints.
The design of special buckles takes into account more complex use environments, such as deep wells, ultra-deep wells, high-pressure gas wells, heavy oil thermal recovery wells, heavily corroded wells, etc., aiming to improve the safety and reliability of the project and the mining life of the oil wells.
3. Performance and Application
Ordinary oil pipe buckle:
The characteristics of ordinary buckle thread include simple processing technology, good sealing, certain connection strength, simple maintenance and use, and low price.
However, they may not meet the requirements under certain extreme conditions, such as high temperature, high pressure, and corrosive environment, resulting in insufficient thread connection strength and sealing.
Special buckle:
Special buckle has higher technical content and processing difficulty, strict quality requirements, complex design, and requires a lot of calculations and rigorous test verification.
They are optimized in terms of sealing performance, torque resistance and corrosion resistance, and are suitable for special well conditions that require high sealing and high-strength connection.
For example, VAM-TOP special buckle and NEWVAM special buckle are high-performance joints designed for specific environments with excellent sealing and mechanical properties.
4. API STC, API LC and API BC are common ordinary buckle types, which implement API 5CT and API 5B standards 5.
Special buckles:
5. There are many types of special buckles, developed by different companies, such as the NEWVAM series and VAMTOP series of Vallourec in France, the series of products of Mannesmann in Germany, and the FOX special buckle of Kawasaki in Japan.
These special buckles have their own characteristics in sealing form, thread design and material selection to meet different usage requirements.
