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CO_2 CORROSION OF STEELS FOR THE OIL GAS PRODUCTION AND TRANSPORTATION

机译：CO_2钢材腐蚀石油和天然气生产和运输

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In the pre-salt fields, in Brazil, oil recovery has been increased by re-injecting carbon dioxide extracted from the wells. Deeper oil/gas reservoirs contain large quantities of CO_2 and, therefore, CO_2 corrosion is an up to date issue and as such newer attempts are been made to study the mechanisms of the C02 corrosion. The present work attempt to identify the nature of the scales formed on the surface of a P110 steel (case tube) and an API 5L X80 steel (transportation pipeline) which have different uses in the oil and gas industry, under static conditions at 25°C, 50°C and 75°C and 55 bar CO_2 partial pressure for 7(168h), 15(360h) and 21(504h) days respectively. At 50°C, the corrosion rate is reduced after 15(360h) days, showing a tendency to become constant. For both temperatures 50°C and 75°C, the corrosion rate reduced with increasing time. The scale formed at 50°C and 75°C, identified by XRD, was almost 100% FeCO_3, at 25°C no protective scale was found.
机译：在巴西的预盐场中，通过重新注入从孔中提取的二氧化碳来增加石油回收。更深的油气储层含有大量的CO_2，因此，CO_2腐蚀是最新的问题，因此已经进行了这种新的尝试来研究CO 2腐蚀的机制。目前的作品试图识别在25°的静态条件下在油气工业中具有不同用途的P110钢（壳管）和API 5L X80钢（运输管道）上形成的鳞片的性质。 C，50°C和75°C和55巴CO_2分别为7（168小时），15（360h）和21天（504小时）的分别。在50℃下，在15（360小时）天后腐蚀速率降低，显示出变为恒定的趋势。对于50°C和75℃的温度，随着时间的推移，腐蚀速率降低。由XRD鉴定的50℃和75℃形成的刻度几乎是100％FECO_3，在25℃下未发现保护尺度。

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