With the development of petroleum industry, most of the oil fields in China have entered a medium- high water cut stage. In this stage ,due to the factors such as high sulfuric acid content in most of the petroleum in our country, the corrosion degree of petroleum machinery is increasing, which causes serious effect on the oil production and meanwhile results in kinds of accidents during production. Below we analyze the reasons for the corrosion of oil machinery, and then explore the effective measures to prevent the corrosion of oil machinery, so as to provide the basis for the development of the oil industry.
With the rapid development of the petroleum industry, the technology of preventing and controlling the corrosion of petroleum machinery has become an important factor to restrict the development of the oil industry. For the long-term development of the oil industry, the good oil machinery is the guarantee of the development of the oil industry, not only can improve the daily production of oil, but also can prolong the life of the petroleum machinery. In addition, it can also save the cost of petroleum enterprise development, so that the oil companies can maximize the economic benefits. Therefore, oil companies should strengthen the development and innovation of the petroleum machinery corrosion technology, to provide a strong guarantee for the development of the oil industry.
The reasons resulting in the corrosion of petroleum machinery are as below.
1. Polysulfide in the oil leads to the corrosion of oil machinery
Most of the oil in our country contains polysulfide, in the process of oil exploitation, oil machinery and equipment contacting with oil is easy to be corroded, and then their surfaces will produce a variety of polysulfides which will bring many unstable factors to the oil machinery in the process of oil machinery operation. In addition, the long exposure of mechanical equipment in the air, where the carbon dioxide and water will react with the corrosion part of the mechanical equipment, the final result is that the whole oil machinery and equipment will be corroded more seriously.
2. Sulfide in the oil leads to the corrosion of oil machinery
This corrosion phenomenon is mainly caused by impurities in the oil product, the main component of these impurities is the sulfide. Sulfide reacts with water in oil, resulting in a large amount of hydrogen sulfide in the oil, which will cause serious corrosion to the petroleum machinery equipment due to its reductibility and acidity. In addition, a lot of chemical impurities in the oil also cause heavy corrosion of oil machinery and equipment.
3. Chloride in the oil leads to mechanical corrosion
According to the survey, much of the oil now contains a lot of brine, if the brine is hydrolyzing, it will be transformed into hydrochloric acid. For petroleum machinery, hydrochloric acid is a key factor in the corrosion, the serious corrosive oil machinery and equipment will reduce the quality and safety of oil machinery equipment.
4.The naphthenic acid in oil results in the corrosion of petroleum machinery
The naphthenic acid is now the main component of organic acid in oil, it has a strong chemical properties, and it can react with iron of petroleum machinery , resulting in serious corrosion of the iron, so that the safety, reliability and quality of the oil machinery and equipment are greatly reduced, and finally the oil production will be restricted.
The Anti-corrosion Technology Measures for Petroleum Machinery
1. The use of highly effective anti-corrosion coatings
In order to prevent the corrosion of petroleum machinery, high efficient anti-corrosion coatings should be used. For example, the anti-corrosion coatings with the nature of environmental protection,acid resistance as well as the anti-corrosion coatings with inorganic polymer properties etc., these anti-corrosion coatings are able to play a role in the anti-corrosion of acidic substances in oil, which play an important part in the control and prevention of the corrosion situation of the petroleum machinery. The first is environmental and anti-corrosion coating, the main anti-corrosion principle of which is to reduce the organic acid, hydrochloric acid, hydrogen sulfide and other acidic organic compounds or acid compounds that can cause the corrosion of petroleum machinery . Next is the inorganic polymer coating, the anti-corrosion principle of which is to prevent and control the the dispersed metals and metal oxides in oil, hence the anti-corrosive purpose could be achieved.
2. The novel anti-corrosion materials for petroleum machinery manufacture
In the manufacture of petroleum machinery, some new materials with stronger, higher and more complete anti-corrosion properties can be used to solve the corrosion problems from the source . For the petroleum machinery manufacturing materials, the materials with strong oxidizing, reducing resistance and strong resistance to acid should be selected scientifically and reasonably, thereby providing higher safety for petroleum machinery and equipment manufacturing, higher quality and more reliable material, so as to improve the anti-corrosion performance of the petroleum machinery equipment, to solve the corrosion problem of petroleum machinery, ultimately ensure the smooth completion of the oil production.
3. Electrochemical anti-corrosion
The so-called electrochemical anti-corrosion is to use the electric current to reduce the corrosion speed of the machine. The anti-corrosion principle of this method is the movement of electrons in the process of corrosion. Before the cathodic protection of the current cathodic protection, the corrosion resistance of the material is achieved by the method of sacrificing the packing of the cathode. If there are enough electrons in the metal surface of the machine, then the corrosion phenomena will become slow or stop. Now the electrochemical corrosion prevention method in the case of different objects.
Type Info: Company News
Keywords for the information: anti-corrosion, petroleum machinery