Corrosion and protection of oil pipeline and gas pipeline

PINDEE STEEL PIPE, As for oil pipeline and gas pipeline equipment, due to the strong corrosiveness of the medium they transport, this may lead to pipeline corrosion, resulting in perforation and leakage accidents, and ultimately causing losses to oil and gas field production.

OIL PIPELINE AND GAS PIPELINE EQUIPMENT

This article used API 5L Steel Tube manufacture in China,PINDEE analysis the causes of corrosion of oil and gas pipelines, and formulates corresponding protective measures, It is hoped that this study can be helpful for the development of the oil and gas industry

1. PINDEE ENGINEERING ANALYSIS THE CORROSION SITUATION OIL PIPELINE,GAS PIPELINE

We can be the first of all, oil and gas pipelines usually buried underground, long distance pipelines are used for transportation tasks to enhance the economic benefits of oil and gas and natural gas transportation. By analyzing the specific situation on the production site, it can be seen that pipeline transportation is the best solution, and therefore has been well promoted and used.

Due to the fact that oil and gas pipelines are usually laid underground, there is a significant degree of soil corrosion and electrochemical corrosion, resulting in a decrease in the maximum load-bearing capacity and anti-corrosion performance of the pipelines. This may lead to leakage of oil and gas from Chengdu, and if severe, it may cause fires or other serious accidents, causing damage to the interests of the country and government agencies. In some environments, corrosive substances exist in the soil, which can form batteries under these conditions, leading to corrosion and posing a threat to the safety of pipelines. The quality of these steel pipes will also have a significant negative impact on the entire transportation process.

Usually for metal pipelines, API 5L PLS1 PLS2 Carbon Steel ERW LSAW SSAW Pipe,Cathodic protection technology is usually used for corresponding protection. During pipeline construction, if there are quality problems with cathodic protection, it is impossible to achieve better cathodic protection effect, which is the main reason for severe corrosion of pipelines and greatly shortens their service life.

Some fluids, such as oil and natural gas, still have a high content of sulfur, which can cause corrosion of pipelines. Sulfur in crude oil can precipitate in pipelines. The iron in the pipeline will react with the iron in the steel pipe to produce ferrous sulfate compounds, which will contain free acids. This in turn will cause hydrolysis reactions, thereby exacerbating the above-mentioned corrosion.

When these steel pipes are transported for natural gas or oil, if there is a certain degree of fluctuation in the transport stress, it can even cause corrosion. There may be slight fluctuations during transportation, and even small cracks. Over time, they will exhibit expansion and swelling, ultimately leading to the risk of major rupture.

2. PINDEE PIPE SOLVE TEH ANTI CORROSION TECHNICAL WHEN WE APPLY THE OIL PIPELINE AND GAS PIPELINE

In one sentence, pipeline corrosion can occur in two situations, mainly internal corrosion and external corrosion. From the perspective of pipeline corrosion, our company PINDEE should adopt targeted anti-corrosion measures for strict and standardized operations.

In today's era, the promotion and application of internal coating technology are very extensive, and everyone is familiar with this technology. Simply put, there are several aspects of internal anti-corrosion technology, with corrosion inhibitor technology being the simplest and most important. However, internal coating technology and composite pipe technology are indispensable. Seriously speaking, for the most important corrosion inhibitor technology, this technology is widely used. According to international standards, the proportion of corrosion inhibitors is injected into pipelines to achieve the purpose of corrosion inhibition.

Now let's talk about the internationally recognized internal coating technology. 3PE anti-corrosion steel pipes, a carbon steel that looks like a coated pipe, was extended from the American standard to China, where this technology has been widely promoted. Although we started using this technology relatively late, there is a technological gap between us and the United States and Europe. But we strive for excellence, and our company PINDEE STEEL PIPE prioritizes the development of this technology to overcome international challenges. Our company PINDEE applies several types of coatings on the inner layer of steel pipes, including epoxy, modified epoxy, epoxy phenolic, polyurethane, and others. In the third technology steel pipe oil pipeline, these layers are obtained from ceramics and other materials, which are very popular in countries such as Venezuela, Mexico, and Peru.

As an internationally renowned brand, our company PINDEE possesses a technology that can greatly enhance the performance of glass lined composite pipes. Firstly, the strength of the steel pipe must be ensured, and secondly, the effective strengthening of anti-corrosion performance can be promoted.

3. PINDEE PIPELINE ANALYSIS THE MEASURES FOR THE ANTI-CORROSION OIL PIPELINE AND GAS PIPELINE

(1) Cathodic protection technology measures

In order to prevent corrosion of metal pipelines and promote a reduction in pipeline corrosion rate, cathodic protection must be carried out, using pipelines as cathodes for protection,

From on-site analysis, the detailed operational strategy is to sacrifice anode cathodic protection measures and apply current cathodic protection measures. According to the different pipeline systems, targeted cathodic protection operations can be carried out, so there are significant differences in their corrosion conditions. Generally speaking, even natural gas pipelines may come into contact with many different types of soil. Regular maintenance and upkeep are the most effective strategies for implementation, and have been well applied in oil and gas transportation projects. In terms of anode material selection, some of the best materials should be chosen, such as graphite, to achieve effective protection of pipelines, avoid corrosion of metal pipelines, and the resulting safety hazards and ultimate losses.

(2) Technical measures for corrosion monitoring of oil and gas transmission pipelines

In the process of laying oil and gas pipelines, they are often laid in soils of different properties, and it is necessary to complete corresponding anti-corrosion work. In this process, full attention should be paid to chemical reactions, among which electrochemical reactions are one of the key components. Specifically analyzing electrochemical reactions can ultimately lead to a more comprehensive and in-depth study of the actual corrosion of pipelines. In the actual situation in our country, a series of evaluation parameters and standards based on soil corrosion have been established to determine the degree of internal corrosion of optical fibers.

In pipelines, due to the many physical and chemical properties on the surface, it can lead to the deepening of pipeline corrosion. In order to cope with this situation, there should be both a metal as an electrode and an electrolyte that can reflect the environment. Thirdly, there must be a conductive circuit.

Generally speaking, when laying pipelines, it is necessary to pay attention to necessary testing operations, especially environmental corrosion work. To achieve effective completion of this work, it is necessary to be able to actively measure soil corrosion. By carrying out this work,

For example, in the specific process of pipeline corrosion detection, technicians should first complete their work and scientifically and effectively grasp the soil corrosion situation in the area, including corrosion modes, corrosion modes, and other related content. Next, we will focus on effectively measuring the soil and current in the region to achieve effective analysis and evaluation of the entire corrosion situation. In addition, we will also study and judge the current service life of the pipeline. For external corrosion layers without excavation testing, it helps to effectively enhance corrosion resistance. Coating technology is widely used in the anti-corrosion work of the entire oil pipeline. With the help of these special anti-corrosion materials, it is beneficial to promote the effective extension of the pipeline life cycle and improve the appearance and corresponding performance of the pipeline. The monitoring operation is usually carried out with the help of the external corrosion layer damage of the pipeline, and now this technology has developed better and is relatively mature.

It should be noted that during the detection process, if this technique is used, the staff should effectively evaluate the current attenuation value and conduct a closely related potential test. In cathodic protection monitoring, during the specific application process, relevant personnel must measure the potential of the oil pipeline and the potential along the pipeline. After obtaining the corresponding values, they should use power-off measurement method and near reference method to effectively analyze the peeling of the internal anti-corrosion layer of the pipeline.

(3) Improving the corrosion resistance of liquefied petroleum gas pipelines through different types of coating technologies

In order to strengthen the corresponding anti-corrosion measures, technicians should also carry out coating operations,

For example, technicians use coal tar enamel coating technology for corresponding anti-corrosion operations. The application of this material, especially on the surface of pipelines,

Nowadays, this technology is no longer widely used and is slowly being withdrawn from the market. In addition, technicians can use epoxy powder for coating protection. After being applied to the surface of the pipeline, it provides a good barrier for external moisture, preventing corrosion of the pipeline. The use of this material also greatly improves the antibacterial performance of the pipeline. Then, based on this, develop corresponding protective measures. From the above, it can be seen that effective protection of pipelines can be achieved through technologies such as online coating. Adopting scientifically feasible anti-corrosion measures can greatly help extend the service life of pipelines and effectively reduce transportation costs. However, it is important to note that caution must be taken when using this type of coating material to prevent contamination. It can effectively promote internal stress and enhance the wear resistance inside the pipeline. As for epoxy resin material, it has considerable rigidity and can also play a good role in water isolation.

(4) Improving the corrosion resistance of pipelines through repair techniques

If there are corrosion gaps in the pipeline, we should pay attention to this technology in order to effectively repair the corrosion gaps, which will enhance the anti-corrosion performance and extend the life of the pipeline. In today's specific situation, in addition to the above-mentioned technologies, repairs can also be carried out with the help of polyethylene materials. In this technique, repair is achieved by applying primer on the anti-corrosion gap and then using polyethylene tape as an external wrapping to provide effective protection. By using polyethylene material, the external performance of pipelines can be significantly improved. Pipeline repair operations typically use two techniques: hot asphalt pouring repair technology and polyethylene material repair technology.

For example, if hot asphalt pouring repair technology is used for operation, division of labor should be carried out. Firstly, the asphalt material should be melted, and then poured into the corrosion gap. After the pouring is completed, the technical personnel must also start the covering operation, that is, to protect the outer part of the pipeline winding to prevent impurities from entering and avoid damage to the repair effect. However, this technology is typically applied to relatively older pipelines.

4. Analysis

Generally speaking, in order to enhance the overall corrosion resistance and pipeline stress of oil and gas pipelines, technicians must pay full attention to some key points. Conduct in-depth research on the causes of pipeline corrosion,