Oil field equipment "corrosion" and "wear" is known as the two world-class problems, the country about 29200 oil wells have varying degrees of corrosion and wear, with China.oil and gas fieldsThe growth in development life and equipment life is getting worse and worse. In addition, the import of high-sulfur crude oil has increased significantly, and the corrosion problem of refining equipment has also become increasingly prominent. Even more frightening is that the adverse effects of corrosion and wear on the safe and stable operation of equipment will become more and more prominent.

In several main electroplating processes, the chromium electroplating process is wear-resistant and low cost, but the environmental pollution is serious, and it is not resistant to chloride ion corrosion; the electroless nickel-phosphorus plating process is corrosion-resistant but not wear-resistant, and the cost is high; the thermal spraying process The technical indicators are good, but the production cost is high, and it is difficult to promote it on a large scale.

According to a well-known young chemical expert in China and a postdoctoral fellow at the University of California,Hunan Universitydoctoral tutorHe FengjiaoProfessor pointed out: "The study of wear and corrosion caused by the failure of parts shows that most of these failures occur on the surface of the material. The use of surface engineering technology to treat the surface of the material, improve the surface properties of the material, will effectively extend the service life of the parts, therefore, surface engineering in the petroleum and petrochemical industry has an important position."

"From the current point of view, only the performance of tungsten alloy electroplating technology has been greatly improved, and its hardness is equivalent to wear resistance and chromium electroplating. It is not only acid and alkali resistance, low production cost, but also can be configured according to the specific operation conditions of the oil well. The corresponding electroplating process meets its operating requirements. Now, under the same environment, the service life of tungsten alloy electroplating equipment is several times higher. "Professor He Fengjiao explained," The reason why tungsten alloy electroplating has such superior performance is that the coating obtained after tungsten alloy electroplating is a new alloy material. The plating state is amorphous structure. After different heat treatment processes, it can be transformed into amorphous inclusion nanocrystalline or nanocrystalline structure. After testing by the national authority, the alloy has good wear resistance, acid resistance, alkali resistance and salt spray resistance, as well as excellent high temperature oxidation resistance, and the substrate material has a good binding force."

Tungstenalloy electroplating processThe two major problems of corrosion and wear are solved at one stroke. According to statistics, China 300 more than 10,000 tons of oil well pipes every year, while high-end oil well pipes with high technical content and high added value, such as anti-H2S and Cl-anti-corrosion oil pipes, are almost completely imported, with 600000 tons of oil pipes imported every year, worth more than 30 billion yuan. This achievement has obtained 8 patent licenses, won the first prize of the National Machinery Industry Science and Technology Award, and won the national key new product certificate. What makes Professor He even more happy is that the State Environmental Protection Administration has listed this technology as a national key environmental protection practical technology (Class A), and as a resource conservation and comprehensive utilization and environmental protection technology encouraged by the state.

The application of tungsten alloy electroplating process in the petroleum machinery industry can not only solve the pollution problem caused by chromium electroplating, but also improve the performance of various key parts and components in China's petroleum machinery manufacturing industry, bring changes to the entire petroleum machinery manufacturing industry, and promote the overall upgrading of the industrial chain, especially the anti-corrosion and anti-sulfur oil well arm and anti-sulfur drill pipe can be applied to H2S content greater than or equal to 150000 PPM, the extreme corrosive environment with CL-content of 150g/L has enabled my country to reach the international leading level in this industry, and solved the current situation that my country's high-end drilling equipment relies on imported equipment.