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| Effect of Elemental Sulfur on the Corrosion of 825 Alloy in High Temperature and High Pressure Environment Containing CO2/H2S |
| Received:August 04, 2020 Revised:August 21, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.11.002 |
| KeyWord:elemental sulfur 825 alloy electrochemical noise local corrosion high temperature and high pressure electrochemistry H2S/CO2 |
| Author | Institution |
| LI Ke |
Southwest Branch of China Petroleum Engineering construction Co., LTD, Chengdu , China;Sichuan Branch, Key Laboratory of Petroleum Tubing Mechanics and Environmental Behavior, China National Petroleum Corporation, Chengdu , China |
| LI Tian-lei |
Southwest Branch of China Petroleum Engineering construction Co., LTD, Chengdu , China;Sichuan Branch, Key Laboratory of Petroleum Tubing Mechanics and Environmental Behavior, China National Petroleum Corporation, Chengdu , China |
| SHI Dai-yan |
Southwest Branch of China Petroleum Engineering construction Co., LTD, Chengdu , China;Sichuan Branch, Key Laboratory of Petroleum Tubing Mechanics and Environmental Behavior, China National Petroleum Corporation, Chengdu , China |
| LI Jiu-yi |
School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu , China |
| ZHENG Zi-qi |
School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu , China |
| ZHONG Xian-kang |
School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu , China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu , China |
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| Abstract: |
| The work aims to study the effect of elemental sulfur on the corrosion behavior of 825 alloy in high temperature and high pressure environment containing CO2/H2S and provide a basis for evaluating the adaptability of 825 alloy in high temperature and high pressure environment containing CO2/H2S and elemental sulfur. The 825 alloy was respectively placed in the simulated gas field environment with and without elemental sulfur for high temperature and high pressure sulfur-containing experiments. The uniform corrosion, local corrosion, electrochemical corrosion behavior, micro-morphology and chemical composition of 825 alloy were characterized by weight loss method, high temperature and high pressure electrochemical method, scanning electron microscope and energy spectrum test, and the influence of elemental sulfur on the corrosion behavior of 825 alloy in high temperature and high pressure environment containing H2S and CO2 was revealed. In the environment without elemental sulfur, the uniform corrosion rate of 825 alloy was only 0.0217 mm/a, and there was no local corrosion phenomenon and no obvious pitting noise signal was detected. In the environment containing elemental sulfur, the uniform corrosion rate of 825 alloy was as high as 0.469 mm/a, and there were obvious local corrosion characteristics and significant pitting noise signal, which was consistent with the observation results of optical photos. 825 alloy is prone to local corrosion in high temperature and high pressure environment containing elemental sulfur and chloride ions, which is mainly due to the hydrolysis reaction of elemental sulfur in aqueous solution. During hydrolysis reaction, elemental sulfur produces H2S and H2SO4 in local areas, which significantly aggravates the corrosion of 825 alloy under the coupling action of high temperature and chloride ions, and the corrosion products are mainly oxides and sulfides. |
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