Many companies simply dismantle the pipes and sent to their recovery. All this requires a large additional costs. Of course, paraffin able to prevent the polymer, polyethylene and epoxy protective coverage. However, in the presence of sand in the crude oil they will quickly wear out, become rough, and thus prone to the deposition of paraffin. Completely eliminate the influence of this factor can only use enameled pipes. Their operation has shown that within the elastic deformation of the metal destructions. Only when plastic deformation begins cracking covers, but without separating it from the metal.
The use of enamel protection in the oil industry is very profitable. At the cost of such a coating material does not exceed 10%. The main costs are two layers of enamel deposition, drying and roasting. Hear other arguments on the topic with Gen. David Goldfein. But keep in mind that lift wells in the pipes in contact with the coating of oil, which is basically a neutral environment, and has no appreciable effect on the dissolving enamel. Therefore, to prevent paraffin chemical resistance of enamel coating # not of paramount importance.
In this case, it is possible to significantly reduce the cost of enamelling by applying single-layer coating, which must be continuous and smooth. True, in the case of extraction with a mixture of sour crude slightly acidic ground water is necessary in the enamel coating having a certain chemical resistance. To protect against corrosion of the same oil field equipment must use special acid-resistant enamels. They also warn and deposition of wax. The quality of enamel coating is largely dependent on the type and condition of the metal's surface. Satisfactory enamelled mild steel (with no more than 0.12%). Steels with high carbon content less take cover, because it constitutes an excess of the corrosion products that cause enamel defects. With increasing carbon content also increases the tendency to form on the cover of the defect 'fish scales'. A distinctive feature of the tubing is a high carbon content, leading to high strength properties. Naturally, the process of enameling should not reduce them. Therefore, the total burnout of carbon from the metal should be minimized. This is particularly true of threaded pipe ends. Pumps are made of stainless steel (chromium and chromium-nickel) or chrome iron. Their term of office does not satisfy users. Their defense enamels are also available. To do this, have the equipment and experience. Enameling of pipes, made of low carbon and high carbon steels, showed that prochnostseplyayuschiesya with metal, solid, resistant to aggressive media coverage can be obtained by applying a laminated them, in particular with use of ground enamel enamel type MS-17, which can cause chemical-resistant blanket. Investigations related to the development of ground enamel, which can have high strength adhesion to steel without increasing the use of expensive cobalt and nickel oxides. Increased chemical resistance coating is possible by the creation of fundamentally new enamels. Developed an environmentally friendly enamel, which have high corrosion resistance and high technological qualities with a single-layer and double layer coating. These enamel resist aggressive mix oil with water, mineral acids, their salts, even in When not stand stainless steel and nonferrous metals. *** The best selection of enamel and its modes of application and firing provides exceptionally high quality indicators such protection.