增强油井水泥石抗二氧化碳腐蚀方法  

Methods of Strengthening Anti-CO2 Corrosion of Oil Well Cement Stone

作　　者：陆沛青 刘仍光 杨广国[1,2] 丁士东 LU Peiqingg;LIU Rengguang;YANG Guangguo;DING Shidong(State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100101,China;Sinopec Research Institute of Petroleum Engineering,Beijing 100101,China)

机构地区：[1]页岩油气富集机理与有效开发国家重点实验室,北京100101 [2]中国石化石油工程技术研究院,北京100101

出　　处：《材料科学与工程学报》2020年第4期566-570,共5页Journal of Materials Science and Engineering

基　　金：国家重大专项资助项目(2016ZX05060-12);国家重点实验室“页岩气井水泥环失效机理及控制技术研究”资助项目(Z17-L)。

摘　　要：通过改变水灰比、掺入胶乳和纳米液硅等配制不同的水泥浆,测试水泥石在CO2腐蚀后的深度、物理性能和微观结构,研究增强油井水泥石抗CO2腐蚀的方法。研究结果表明:降低油井水泥浆的水灰比、掺入纳米填充颗粒,可减小水泥石的孔隙度和渗透率,使水泥石更加致密,增强了油井水泥石抗CO2腐蚀能力;胶粒析出在水化产物表面连接成膜,阻碍CO2的渗透和扩散,增强抗腐蚀性;纳米液硅中的纳米硅与氢氧化钙反应,减少了易被腐蚀物氢氧化钙的含量,提高了水泥石抗CO2腐蚀能力。Performances and microstructure of oil well cement stones were tested for different water cement ratio through blending with latex and nano liquid silicone before and after corroded by carbon dioxide.The results showed that the porosity and permeability of the cement stone were reduced by decreasing the water cement ratio and blending with filled nano particles.The cement stone was more compact and the anti-carbon dioxide corrosion ability was improved.The film formed by the latex on the surface of cement hydration products could prevent the penetration and diffusion of carbon dioxide and slow down the corrosion progress.The reaction of the active materials in liquid silicone with cement hydration product-calcium hydroxide reduced the content of calcium hydroxide,which was more susceptible to corrosion,and finally the anti-carbon dioxide corrosion ability was strengthened.

关 键 词：油井水泥石 CO2腐蚀 纳米掺合料 渗透率 

分 类 号：TE256[石油与天然气工程—油气井工程]