Corrosion coupons are generally placed in test vessels, on-site inspection heat exchangers, or test pipes. It is a standard metal test piece for the determination of corrosion. It is to detect or evaluate the corrosion status of a cooling water system. Generally, the pre-treated and weighed metal test pieces are placed in the test system for a period of time. (Such as 30 to 90 days). Then we take it out and observe the corrosion and wash and weigh it. In this way, the degree of metal corrosion weight loss, the type of corrosion, and the depth of pitting can be determined. The data of metal coupons have no affection from corrosive media. It also depends on factors such as coupon surface treatment, placement location, exposure time, and sample metallurgy.
Corrosion Coupons are common in the oil field. As far as oil and gas pipelines are concerned, because the medium they transport often has a considerable degree of corrosiveness, this will cause the pipeline to corrode. So this will cause perforation and leakage accidents, which in turn will cause losses to oil and gas production. Therefore, the oil and gas industry needs to carry out regular inspections of corrosion in pipelines. If you need Corrosion Coupons, please contact our professionals to answer them for you.
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Cause analysis of oil pipeline corrosion
Generally speaking, oil and gas pipelines are often on underground. They carry out transportation operations with the help of long-distance pipelines, thus promoting the economic performance of oil and gas transportation. After analyzing the specific situation of the production site, we can see that pipeline transportation is the best scheme. Therefore, it is extremely popular.
As pipelines are usually underground, there is a large degree of corrosion. Such as soil corrosion, electrochemical corrosion, etc. As a result, the pressure bearing capacity and mechanical strength of the pipeline are reduced. This will further cause oil and gas leakage and may lead to fire and other accidents. This will bring economic losses to enterprises. Because there is a corrosive medium in the soil. This makes the pipeline have the conditions to form a galvanic cell. As a result, it causes corrosion perforation, which endangers the safety of the pipeline. In terms of pipeline quality, it will also have a great negative impact on the whole transportation work.
Usually, for metal pipelines, cathodic protection technology often works to carry out the corresponding protection. In the process of pipeline construction, there may be a lack of cathodic protection quality. If not achieving a better cathodic protection effect, it will also cause serious corrosion of the pipeline and greatly reduce the service life.
In petroleum media, there is a certain amount of sulfur, which is a core factor causing pipeline corrosion. Because crude oil often contains sulfur, which will cause a certain degree of sulfur precipitation compounds in the pipeline. The above compounds will generally react with iron in the pipeline. They further form ferrous sulfate compounds. But for these ferrous sulfates, also contains free acid. This condition will cause a hydrolysis reaction, which will aggravate the corrosion based on the above.
Corrosion protection technology for oil and gas pipelines
On the whole, when dividing the forms of pipeline corrosion, there are mainly two forms. This is internal corrosion and external corrosion. Due to the variability of the pipeline corrosion situation, the work should be carried out with the help of targeted anti-corrosion measures.
Today, inner coating technology has been very well promoted and applied. Generally speaking, internal anti-corrosion technology can be divided into several types. Mainly for corrosion inhibitor technology, inner coating technology, and composite pipe technology. As far as corrosion inhibitor technology is concerned, the application of this technology is as follows. Firstly, match the corrosion inhibitor and inject it into the pipeline. Best for corrosion mitigation purposes.
In terms of inner coating, the technology originated in other countries. Today we promote it very well. At present, the anti-radiation inner coatings of oil and gas pipelines in my country mainly include epoxy type, improved epoxy type, epoxy novolac type, and polyurethane type. The third technical composite pipe`s mainly material is ceramics and other materials.
Compared with other technologies, the glass-lined composite pipe can play a great role. Firstly, it can ensure the strength of the steel pipe. Secondly, it can promote the effective strengthening of anti-corrosion properties.
Analysis of corrosion protection measures for oil and gas pipelines
(1) Cathodic protection technical measures
In order to reduce the corrosion rate of the pipeline, we must carry out cathodic protection. This is to take the protected pipeline as the cathode and protect it. So as to avoid corrosion of metal pipes. The detailed operation countermeasures are cathodic protection measures of the sacrificial anode and cathodic protection measures of applied current. According to the differences in pipeline systems, it can carry out targeted cathodic protection operations.
Through the relevant on-site analysis, we can see that in terms of the implementation effect, regular maintenance and maintenance are the most effective countermeasures. And it better works in oil and gas transmission engineering. In the selection of anode materials, we should use some of the best materials. Such as graphite, which can achieve efficient protection of pipelines. This can also avoid the corrosion of metal pipes. And it can avoid potential safety hazards and eventual losses.
(2) Technical measures for monitoring corrosion of oil and gas transmission pipelines
In the process of petroleum gas pipeline laying, it is in soil with different properties. Therefore, there are great differences in corrosion. Generally speaking, even a gas transmission pipeline may contact many soils with different properties.
In the pipeline, there are many physical and chemical properties on its surface. Therefore, it will cause the deepening of pipeline corrosion. To face this situation, we should complete the corresponding anti-corrosion work. In this process, enough attention should be paid to chemical reactions. Among them, an electrochemical reaction is one of the key components. Specifically, based on the electrochemical reaction, there should be not only the metal as the electrode. But also the electrolyte that can reflect the environment. The third must have a conductive circuit.
In general, when carrying out pipeline laying operations, we must pay attention to the necessary inspection operations. In particular, attention should be paid to environmental corrosion. If this work is to be completed effectively, the soil corrosivity can be actively measured. Through this work, we can finally have a more comprehensive and in-depth study and judgment on the actual corrosion of the pipeline. According to the actual situation in our country, a series of evaluation parameters and evaluation standards have been established to evaluate the internal corrosion of optical fibers according to the soil’s corrosivity.
In the process of carrying out specific pipeline corrosion detection, the first thing that technicians should complete is to scientifically and effectively grasp the soil corrosion in their area. This includes corrosion mode and corrosion law. And then focus on the soil in the area, and carry out an effective measurement of the current in it. In this way, effective analysis and evaluation of the whole corrosion situation can be achieved. And in addition, we need to study and judge the current service life of the pipeline. So in terms of the non-excavation detection of the external anti-corrosion coating, the monitoring operation is often carried out with the help of the damage to the external anti-corrosion coating of the pipeline. Nowadays, this technology is well developing and relatively mature.
It should be noted that in the process of testing if this technology is adopted. The staff should carry out an effective evaluation of the current attenuation value. They will also carry out the closely spaced potential test associated with it. Through the use of the above technology, they can carry out the research and judgment of corrosion conditions very well.
In this way, it is possible to analyze and evaluate the overall corrosion condition of the oil pipeline and the stripping condition of the anti-corrosion coating. In terms of cathodic protection monitoring, in the specific application process. Relevant employees must measure the potential of the oil pipeline and the potential along the pipeline. After obtaining the corresponding value, the staff should use the power-off measurement method and near reference method. Therefore, we can realize the effective analysis of the falling-off condition of the internal anti-corrosion coating of the pipeline.
In general, in order to deeply strengthen the overall corrosion resistance and pipeline stress of oil and gas pipelines. Therefore, technicians must pay enough attention to some key points. Make a solid study and judgment on the causes of pipeline corrosion, and then take it as the starting point to build corresponding protective measures. It can be seen from the above that the effective protection of pipelines can be achieved with the help of technologies such as pipeline internal coating. The application of scientific and feasible anti-corrosion countermeasures can greatly prolong the service life of pipelines. And it can also effectively reduce transportation costs.