【作者】 钟显康； 喻丝雨； 陈龙俊； 宋晓琴； 扈俊颖； 张智； 施太和；

【Author】 ZHONG Xiankang;YU Siyu;CHEN Longjun;SONG Xiaoqin;HU Junying;ZHANG Zhi;SHI Taihe;School of Oil and Natural Gas Engineering,Southwest Petroleum University;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University;

【机构】 西南石油大学石油与天然气工程学院； 油气藏地质及开发工程国家重点实验室(西南石油大学)；

【摘要】 空气驱油是一种经济、高效的提高采收率技术,然而,注气管线的氧腐蚀问题严重限制了高压空气驱油技术的广泛应用。本文采用了扫描电镜、X射线衍射和透射电镜对N80钢在高压空气驱油模拟环境中形成的腐蚀产物进行了检测分析,结果表明,高压空气驱油环境中形成的腐蚀产物具有双层结构,外层腐蚀产物疏松多孔、容易脱落,内层腐蚀产物较外层致密。腐蚀产物的成分为:α-Fe₂O₃、α-FeOOH、Fe₃O₄,以及少量的Ca（OH）₂和CaO。另外,腐蚀产物的微观结构和成分不随温度和氧分压的变化而变化。更多还原

【Abstract】 High pressure air injection（HPAI） is an effective and economic improved oil recovery process,however,the corrosion of tubing and casing in the injection well is one of the serious safety concerns which have limited its widely application.In this work,the corrosion products formed under simulating HPAI environment were analyzed using scanning electron microscopy coupled with energy dispersive spectroscopy（SEM+EDS）,X-ray diffraction（XRD） and transmission electron microscopy（TEM）.The corrosion products showed two layers:outer layer and inner layer.The outer layer was porous,brittle and easily flaked off,while the inner layer was more compact than the outer layer.The corrosion products were composed of hematite（α-Fe₂O₃）,goethite（α-FeOOH）,magnetite（Fe₃O₄） and trace amount of Ca（OH）₂ and CaO.In addition,the structure and composition of corrosion products do not change with the temperature and oxygen partial pressure in the simulating HPAI conditions.更多还原