Abstract Gel capsules of calcium alginate as a matrix stuffed with a non-ionic surfactant, namely 2-(2-(3,4-bis(2-methoxyethoxy)tetrahydrofuran-2-yl)-2-(2-methoxyethoxy)ethoxy)ethyl stearate, Tween-60, as an inhibitor was prepared by a piercing-solidifying method for corrosion protection of carbon steel tubes from produced water in acidizing oil wells. The Fourier transform infrared and thermal gravimetric analysis techniques were used to study the properties of the capsules. The release of the inhibitor from the solid capsules to the corrosive acidizing produced water was studied gradually using ultraviolet-visible spectroscopy. A heavy additive was used to promote the sinking of the capsules in the oil well downhole tubes. The inhibitive effect of the released inhibitor on carbon steel in the corrosive produced water in acidizing oil wells was investigated using weight loss measurement, potentiodynamic polarization, electrochemical impedance spectroscopy, and morphologically by scanning electron microscopy. It was found that the inhibition efficiency increases with the increase of inhibitor release. The increase in temperature leads to partial desorption of inhibitor molecules at the metal surface, which causes increase in the corrosion rate. The positive sign of the activation enthalpy (ΔHa) reflects the endothermic nature of the carbon steel dissolution process.

中文翻译：

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加载在凝胶胶囊上的非离子表面活性剂可保护井下管道免受酸化油井中采出水的影响

摘要 以海藻酸钙为基质填充非离子表面活性剂即2-(2-(3,4-双(2-甲氧基乙氧基)四氢呋喃-2-基)-2-(2-甲氧基乙氧基)乙氧基)的凝胶胶囊硬脂酸乙酯 Tween-60 作为缓蚀剂通过穿孔固化法制备，用于对酸化油井采出水中的碳钢管进行腐蚀保护。傅里叶变换红外和热重分析技术用于研究胶囊的性质。使用紫外-可见光谱逐渐研究了抑制剂从固体胶囊向腐蚀性酸化采出水中的释放。使用重添加剂来促进油井井下管中的胶囊下沉。采用失重测量、动电位极化、电化学阻抗谱和扫描电子显微镜形态学研究了缓蚀剂对酸化油井腐蚀性采出水中碳钢的抑制作用。发现抑制效率随着抑制剂释放量的增加而增加。温度升高导致金属表面抑制剂分子部分解吸，从而导致腐蚀速率增加。活化焓 (ΔHa) 的正号反映了碳钢溶解过程的吸热性质。发现抑制效率随着抑制剂释放量的增加而增加。温度升高导致金属表面抑制剂分子部分解吸，从而导致腐蚀速率增加。活化焓 (ΔHa) 的正号反映了碳钢溶解过程的吸热性质。发现抑制效率随着抑制剂释放量的增加而增加。温度升高导致金属表面抑制剂分子部分解吸，从而导致腐蚀速率增加。活化焓 (ΔHa) 的正号反映了碳钢溶解过程的吸热性质。