微硅固井水泥石的抗CO_(2)腐蚀性能  

CO_(2)Corrosion Resistance of Cementing Stone with Micro Silicon

作　　者：房恩楼[1] 刘仕康 王学春 赵军[1] 王强 宋建建[2] FANG Enlou;LIU Shikang;WANG Xuechun;ZHAO Jun;WANG Qiang;SONG Jianjian(China Oilfield Services Co.,Ltd.,Sanhe 065201,China;College of Petroleum Engineering,Yangtze University,Wuhan 430100,China)

机构地区：[1]中海油田服务股份有限公司,三河065201 [2]长江大学石油工程学院,武汉430100

出　　处：《腐蚀与防护》2022年第9期41-45,117,共6页Corrosion & Protection

基　　金：国家科技重大专项课题(2017ZX05032004-004)。

摘　　要：通过测试腐蚀前后固井水泥石的渗透率、抗压强度和腐蚀深度,评价了不同微硅添加量的固井水泥石的耐蚀性,采用扫描电镜(SEM)和X射线衍射仪(XRD),分析了微硅固井水泥石的抗CO_(2)腐蚀性能。结果表明:与空白固井水泥浆相比,添加3%、6%和9%微硅的固井水泥浆的稠化时间缩短了11~38 min,失水量降低了8~27 mL,自由液降低为0,微硅固井水泥石的抗压强度和抗折强度分别提高了11.1%~46.7%和49.8%~104.9%,渗透率降低了0.026~0.046 mD,微硅促进了固井水泥浆的水化过程;当微硅添加量为9%时,腐蚀21 d后微硅固井水泥石的抗压强度衰退率和渗透率变化率分别为8%和16%,微硅的添加提高了水泥石的抗CO_(2)腐蚀性能,且微硅添加量越高,固井水泥石的抗CO_(2)腐蚀性能越好;微硅的添加提高了固井水泥石的致密度,在一定程度上降低了固井水泥石的腐蚀程度。By testing the permeability,compressive strength and corrosion depth of cementing stone before and after corrosion,the corrosion resistance of cementing stone with different micro-silicon additions was evaluated.Using scanning electron microscope(SEM)and X-ray diffractometer(XRD),the CO_(2)corrosion resistance of micro-silicon cementing stone was analyzed.The results showed that compared with the blank cementing stone,the thickening time of cementing stone with 3%,6%and 9%micro-silicon added was shortened by 11-38 min,the water loss was reduced by 8-27 mL,and the free liquid was reduced to 0,compressive strength and flexural strength of micro-silica cementing cement were increased by 11.1%-46.7%and 49.8%-104.9%,respectively,and permeability was reduced by 0.026-0.046 mD.When micro-silicon addition amount was 9%,the compressive strength decline rate and permeability change rate of micro-silicon cementing stone after corrosion for 21 days were 8%and 16%,respectively.The addition of micro-silicon improved the CO_(2)corrosion resistance of cementing stone,and the greater the amount of micro-silicon added,the better the CO_(2)corrosion resistance of cementing stone.The addition of micro-silicon improved the density of cementing stone and reduced the corrosion degree of cementing stone to a certain extent.

关 键 词：微硅 固井水泥石 二氧化碳 腐蚀 

分 类 号：TE256[石油与天然气工程—油气井工程]