1 Science and Figure Center, West-East Gas Transmission, National Pipe Network Group, Shanghai 200131, China 2 Jiangsu, Zhejiang, Shanghai Branch, West-East Gas Transmission, National Pipe Network Group, Nanjing 210001, China 3 School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China
Abstract: Tight oil in Block H of an oilfield is extracted by injecting multiple thermal fluids, and the extract contains CO2, H2S and O2, etc. The high-temperature mixed gas flow into the gathering and transportation pipeline forms a CO2/H2S/O2 corrosion system, and the corrosion problem of the pipeline system is serious. Therefore, in view of the characteristics of large variation of O2 content in the field products, the corrosion behavior of L245NS steel at different O2 content (0%, 1%, 2%, 3%) was studied in a high temperature and high pressure reactor, and the composition and microstructure of the corrosion products were analyzed. The results show that the uniform corrosion rate increases with the increase of O2 content. The O2 participates in the cathodic depolarization reaction, and oxidizes Fe2+ to form loose and porous high valence oxides of Fe, which inhibits the formation of FeCO3. At the same time, the interaction between O2 and H2S was enhanced, and the generated S element continued to participate in the corrosion reaction, resulting in the decline of product protection performance. The results of local corrosion rate showed that it increased first and then decreased with the increase of O2 content. When the O2 content is 2%, it has a maximum value, and when the O2 content is high, it can inhibit local corrosion. Based on the experimental results, more corrosion-resistant alloy steel can be selected for the selection of gathering and transmission pipeline materials. If the O2 content of the produced product is controlled below 1%, the corrosion of steel can be minimized.
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2025, Vol. 39 
