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Tubing are intended for a wide range of works from pumping out of oil and gas from a well cavity before production of various repair work. With their help on oil fields carry out raising of oil from a productive zone of layer to well head and also force water for maintenance of reservoir pressure. The main problem at operation of these pipes are refusals because of corrosion defeat. The main types of corrosion destructions of tubing connected with presence at the obtained environment of carbon dioxide and hydrogen sulfide are given in the paper. One of the ways of protection of an internal surface of tubing is the use of corrosion inhibitors – chemical reagents which introduction in small dosages on corrosion Wednesday significantly reduces metal corrosion rate. Results of experiments on corrosion inhibitor selection for protection of the oil-field equipment of one of fields of the Russian Federation are given in the paper.

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Heat-resistance (scale resistance) is the steel corrosion fastness in dry gas at high temperatures. At the temperatures over 570 °С, the ferrous alloys oxidize, as ferric oxide (wustite) with simple cubic lattice appears on the metal surface. Such oxide lacks oxygen atoms (omission solid solution) and does not interfere with the diffusion between metal and oxygen. As a result of this process the brittle oxide-scale develops and the loss of metal increases. In order to increase the heat-resistance of steel, different alloying elements are included into its composition, forming oxides with the tight structure of crystal lattice. In this paper we’ve investigated the heat-resistance of some structural steels and analyzed their corrosion resistance in the high temperature aggressive environments of chemical productions.

The complex of negative effects of hydrogen on metal, leading to destruction of metal structures, is commonly called hydrogen corrosion. The object of the study was a sample of steel A 516-55 condensate collector of the main gas pipeline, which was subjected to hydrogen stratification. The aim of the work was to establish a link between the non-uniformity of the metal and its tendency to hydrogen stratification. The work solved problems that were aimed at studying the physical and mechanical properties and microstructure of the analysed metal. X-ray fluorescence analysis was carried out to identify the causes of discontinuities within the metal. A light microscopy method was carried out to study the microstructure of the test sample taken from the focus zone of the condensate collector destruction. The microstructure was examined using the “METAM RV - 22 type EU LOMO metallographic microscope. An X-ray fluorescence analysis was carried out to determine the causes of the discontinuity within the metal. Tests were performed on a EDX-800HS spectrometer at various X-ray tube operations. It has been found that the inhomogeneities are due to the uneven distribution of manganese in the metal body. A post-publication change was made to this article on 11 Jun 2020 to correct the pdf so that it matched the webpage.

Corrosion inhibitors are widely used for protection of technological equipment and pipelines in the oil and gas industry. However, the operation of these objects under the influence of corrosive media of high aggressiveness and the widespread use of new constructive materials call for development of increasingly effective reagents. In this regard, the creation of competitive inhibitors that provide a high protective effect is a very urgent task, the solution of which is of significant importance for the country's economy. The paper considers the synthesis of new corrosion inhibitors based on quaternary ammonium compounds and the study of the effectiveness of their practical application in the implementation of anticorrosion protection of oilfield equipment made of carbon steel 20 and low-alloy steel. It has been established that as a result of the synthesis based on triethanolamine and orthophosphoric acid, triethylamine and 1,3-dichloropropene, and also condensation of polyethylene polyamine with 1,2-dichrolylethane, it is possible to obtain high-molecular compounds that effectively inhibit corrosion processes in oil and gas equipment proceeding along the electrochemical mechanism. To study the protective properties of the developed corrosion inhibitors, gravimetric analysis was used. It has been established that some nitrogen- and phosphorus-containing quaternary compounds under conditions similar to those in oil fields exhibit rather high inhibitory protection effects, and therefore can be recommended as a basis for the creation of new inhibitors of corrosion of tubular steels in mineralized reservoir environments. It is shown that the maximum inhibitory protection effects of the developed inhibitors are achieved at their moderate concentrations in the mineralized formation water, and with an increase in the concentration, the corrosion rate of the tested tubular steels is substantially reduced.Forcitation:Khaydarova G.R., Tyusenkov F.S., Bugai D.E., Raskildina G.Z., Islamutdinova A.A., Sidorov G.M. Development and testing of corrosion inhibitors properties based on quaternary ammonium compounds. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N7. P. 130-136