HHS-08油溶性咪唑啉缓蚀剂作用规律及分子动力学模拟

ACTING LAW AND MOLECULAR DYNAMICS SIMULATION OF OIL-SOLUBLE IMIDAZOLINE CORROSION INHIBITOR HHS-08

对HHS-08油溶性咪唑啉缓蚀剂(简称HHS-08缓蚀剂)在应用超临界CO 2驱油技术的油田采出水环境中的作用规律进行了研究。向上述油田采出水中添加不同质量浓度的HHS-08缓蚀剂,利用CHI604E电化学工作站对极化曲线、电化学阻抗谱进行测试;通过Materials Studio 8.0软件对HHS-08缓蚀剂在Fe(001)晶面的吸附行为和作用机理进行了研究。宏观形貌、失重试验、极化曲线和阻抗谱试验结果表明:随着HHS-08缓蚀剂加入量的增加,缓蚀率逐渐提高;当HHS-08缓蚀剂质量浓度达到80 mg L时,缓蚀率达到80%以上;继续增大缓蚀剂加入量,缓蚀率增加幅度减小。分子动力学研究结果表明,HHS-08缓蚀剂分子可以通过自身的扭转形变,使缓蚀剂分子中的极性头基(咪唑环)稳定吸附在Fe(001)晶面上,而烷基碳链则背离金属表面形成疏水膜,从而实现良好的缓蚀作用。

The application of supercritical CO 2 flooding technology brings huge safety risks to the storage,transportation in the downstream of the petroleum industry.The law of corrosion inhibition of HHS-08 oil-soluble corrosion inhibitor(HHS-08 corrosion inhibitor)in the environment of supercritical CO 2 flooding oilfield water was studied.HHS-08 inhibitor with different concentration was added to the above oilfield water successively,and polarization curves and electrochemical impedance spectroscopy of the corrosion system were tested by CHI604E electrochemical workstation.The adsorption behavior and mechanism of HHS-08 corrosion inhibitor on the Fe(001)plane were investigated by Materials Studio 8.0.The results of macroscopic morphology,corrosion weight loss test,polarization curves and impedance spectroscopy showed that the inhibition rate increased with the increase of HHS-08 inhibitor dosage.The corrosion inhibition efficiency reached a value of more than 80%at the concentration of 80 mg L,however,the inhibition efficiency increased little when the dosage was increased further.The results of molecular dynamics showed that the HHS-08 inhibitor molecule could stably adsorb the polar head group(imidazole ring)on the Fe(001)plane through its own torsion deformation,while the alkyl carbon chain deviated from the metal surface to form a hydrophobic film,thus achieving good corrosion inhibition.