In recent years, China’s oil and gas transportation methods mainly rely on oil and gas pipeline transportation to transport oil and gas through long-distance pipelines. This method is widely used in China, but this transportation method also contains a safety hazard because Pipes made of steel under the corrosion of oil and gas medium are prone to corrosion. In addition, due to some pressure, temperature and humidity from outside, the corrosion phenomenon is more serious. If oil and gas leaks during transportation, it will cause Severe fires, so it can be seen that it is crucial to strengthen the anti-corrosion and protection measures in oil and gas pipeline transportation.
1 Influence of soil corrosion
The impact of soil corrosion on pipelines is more serious. According to the data survey results, it has appeared in China’s northeast, north China, South China and other regions.
Pipeline leakage caused by corrosion of soil. The main reason for these problems is caused by corrosion of both the inner and outer walls of the pipe. In the mid-1990s, due to the inadequacy of China’s defense measures, many oil and gas pipeline leaks caused hundreds of billions of economic losses to China. In contrast, pipeline corrosion in some areas close to the sea is more serious.
2 Oil and gas pipeline anti-corrosion measures
2.1 Safety issues of oil and gas pipelines
The safety of oil and gas pipelines is of paramount importance. In recent years, many soil pipelines are often affected by water, oxygen, minerals and some microorganisms, which will lead to the aging of pipelines. . In addition to this, there will be some illegal people who want to steal some interests through illegal punching, which leads to more and more cracking and stripping of the pipeline, which intensifies the corrosion of the pipeline.
2.2 Oil and gas pipeline corrosion control problems
2.2.1 Quality control during pipeline construction
In the initial stage of pipeline construction, it is very important to strengthen the quality control of pipeline construction. In the pipeline exploration, not only the quality of the soil needs to be detected, but also the direction of the pipeline line, which will be related to the later stage. Corrosion of the pipeline, it is necessary to pay attention to the construction process during construction, because the order of each process will be related to the overall quality of the pipeline, in addition to the construction of the pipeline should be resolutely put an end to Steel pipes for quality problems are put into use.
2.2.2 Pipe section corrosion and control
In the corrosion and control of pipelines, in order to better protect the quality of pipelines, people often pay attention to the problem of solder joints at joints. Because the pipelines are underground for a long time, if they can not be treated properly, Long-term will lead to groundwater infiltration, and when groundwater enters the toroidal pipeline, there will be some leakage problems. Since the pipe segments need to be welded at the time of joining, they are often affected by some welding points, thermal stress, etc., so it is very important to strengthen management and attention in this respect.
2.2.3 Research on waste pipe
Strengthening the research on waste pipe can help to improve the anti-corrosion efficiency of waste pipe. Under normal circumstances, pipes that have been in the underground environment for a long time often cause leakage due to corrosion. In response to this problem, the author suggests that it can be strengthened. Research on waste pipes to find out the cause of corrosion. Personnel in the relevant departments can provide corrosion information on the corrosion of the pipeline by detecting the corrosion of the inner and outer walls of the pipeline, and then conduct a comprehensive study and investigation on the causes of corrosion.
2.2.4 Regular inspection and verification
Regular anti-corrosion testing and verification of oil and gas pipelines is very important. In order to better ensure the normal transportation of pipelines, strict control of corrosion detection and verification should be carried out. In fact, there are many ways to prevent corrosion. People can enhance the corrosion protection of oil and gas pipelines by cathodic protection, adding coatings or injecting some chemicals.
2.3 Main measures for anti-corrosion of oil and gas pipelines
2.3.1 Anti-corrosion of the inner and outer walls of the pipeline
Because oil and gas pipelines are underground for a long time, they are often corroded by some media. In the 1950s, people often chose to use asphalt and coal tar pitch as anti-corrosion materials, and in the later period, people gradually began to choose adhesive tape. Or use a thermoplastic coating to achieve the purpose of anti-corrosion of the pipeline. According to relevant statistics, after the anti-corrosion measures are added, the speed of the pipeline can be effectively reduced, and the corrosion of the pipeline can be delayed.
2.3.2 Inner coating
During the transportation process of the pipeline, if the inner coating is used for corrosion protection, the corrosion protection of the oil and gas pipeline can be effectively realized, because the corrosion protection of the inner coating can not only effectively isolate some corrosive media, but also can play on the inner wall of the pipeline. It promotes the smoothing effect and reduces some friction on the inner wall of the pipe, which can also reduce the cost. According to the survey results, the anti-corrosion technology of the thermal spray glass used in the inner coating can play a three-fold high temperature, which plays a significant role in promoting the corrosion protection of oil and gas pipelines.
The application of anti-corrosion coatings is also extensive. This technology is often used in soil environments. It should be noted that if there are some rocks or high-water potentials involved in oil and gas pipelines, they must be used with caution. Another type of outer coating is the PE coating. This technology is suitable for use in harsh environments where mechanical strength is critical. In the anti-corrosion of the outer coating, it is necessary to screen the selection of the outer coating according to the geological environment. In addition to this, there is a double-layer epoxy powder coating in the outer coating. This outer coating is suitable for a wide range.
2.3.4 Cathodic protection
Cathodic protection mainly uses chemical methods to protect the materials in the pipeline from being oxidized. Cathodic protection mainly uses generators or power plants to supply current, so that the materials of some pipelines become less active and thus protect the pipeline. In addition, in order to achieve better protection of the pipeline effect, it should also keep the pipeline at a stable potential, and at the same time, it should be noted that the pipeline should be as close as possible to other unrelated buildings. insulation. This can play a very important role in the corrosion protection of oil and gas pipelines.
2.3.5 Drainage protection
The drainage protection is mainly based on whether the pipeline has positive or negative alternating current, and the pipeline material is treated by corresponding drainage. The use of drainage protection needs to pay attention to the positive and negative alternating current in oil and gas pipeline transmission. The tributary drainage is selected. When positive and negative alternating current occurs, the polarity drainage should be selected. When the situation is complicated, it is also necessary to adjust the mandatory drainage. Only by controlling the gains and losses of electrons in the current can the protection of the pipeline be better.
2.3.6 Electrochemical protection
Electrochemical protection is very common in today’s oil and gas pipelines. It is very common to use this method for electrochemical corrosion. In domestic long-distance oil and gas pipelines, the use of electrochemical protection can not only effectively sacrifice The cathodic protection method supplemented by the anode can also connect the protection pipe to the negative pole of the power supply to achieve the current protection.
3 Anti-corrosion development trend of oil and gas pipelines
In China’s oil and gas pipeline transportation development, more and more people have already taken anti-corrosion measures in oil and gas pipelines as an important task. With the continuous development of society and science and technology, China has developed many high-tech Materials, the good application of these materials to the anti-corrosion of oil and gas pipeline transmission, can lay a more solid foundation for China’s economic development and oil and gas enterprise progress.
In summary, the author briefly discusses some anti-corrosion and protection in the process of oil and gas pipeline transportation. Through analysis, it can be found that it is very important to strengthen the protection of oil and gas pipelines. The pipelines that protect oil and gas can not only reduce Chinese resources. The waste can also contribute to China’s economic development. Doing a good job in protecting oil and gas pipelines is also laying the foundation for a sustainable development strategy.
Source: China Steel Pipeline Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)