Anti-corrosion coatings are commonly used in the oil and gas industry to protect the inner surface of pipelines. Most of coatings have a polymer base and can effectively prevent the negative impact of the transported fluid. Existing standards allow to evaluate the quality of coatings and their durability in the anticipated operating conditions. The evaluation of the abrasive resistance of coatings usually limited to comparative tests on a Taber abraser. This paper presents the results of hydroabrasive resistance study of coatings using nonstandard technique. Comparative test results of various polymer (FBE), thermally sprayed coating and silicate coatings are obtained. The ways of modifying test method are proposed.
The article considers the possibility of increasing the efficiency of chemical reagents by treating inhibited solutions with a magnetic field. It is shown that a various method for generating the magnetic field has a different effect (Some positive some negative). The best results can be achieved with anti-scale magnetic treatment using permanent magnets. Modified inhibitors (after magnetic treatment) have enhanced protective effectby their adsorption capacity with respect to metal increases.
In the manufacture of large-diameter welded pipes used for the construction of pipelines operating at high pressure, it is extremely important to provide the required mechanical and service characteristics. One of the main tasks of improving the quality of each batch of sheet metal, while maintaining or reducing the cost of production of pipes, is to provide a set of mechanical properties. The problems of obtaining proper mechanical characteristics of sheet products of the widely used 10G2FB steel during its production have been raised for several years. This is explained by the facts that this steel is still used in the construction of trunk pipelines and the technological process for the production of rolled products is a multi-factor system, the accomplishment of each stage of which directly affects the quality. In this paper, we consider issues related to the study of the texture state of samples cut from 6 pipes (from different batches, different manufacturers) made of 10G2FB lowcarbon steel in order to construct direct and inverse pole figures and determine the role of texture formation in the properties of the base metal. A comparative analysis of the obtained results of mechanical tests is carried out. A comparison of the test results for impact toughness and crack resistance with the results of texture analysis showed that pipe samples, in the structure of which after rolling the textures were formed, which were determined as maximum when controlling reflections from a series of planes (110), showed the best viscous properties in low temperature impact bending tests and in the entire range of studies in tests for crack resistance.
The most damaged elements of oil field pipelines are welded joints, the life of which often does not exceed one or two years. The problem of anticorrosive protection of internal surfaces of welded pipe joints has not been solved to date. In this paper, the possibility of applying powder protective stainless coatings to the inner edges of the pipe adjacent to the annular weld is considered. The research of corrosion resistance and mechanical properties of pipe welded joints is presented.
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