CCUS井封隔器胶筒耐二氧化碳腐蚀性能评价  

CO_(2) Corrosion Resistance Evaluation of Packer Rubber in CCUS Wells

作　　者：王邃 宋少华 陈森[4] 张立义[4] 陈治军[4] 李彦鹏 WANG Sui;SONG Shaohua;CHEN Sen;ZHANG Liyi;CHEN Zhijun;LI Yanpeng(CMPC Tubular Goods Research Institute,Xi'an 710077,Shaanxi,China;State Key Laboratory of Oil and Gas Equipment,Xi'an 710077,Shaanxi,China;Shaanxi Jiuzhou Petroleum Engineering Technology Service Co.Ltd.,Xi'an 710075,Shaanxi,China;Production Technology Research Institute,PetroChina Xinjiang Oilfield Company,Karamay 834000,Xinjiang,China)

机构地区：[1]中国石油集团工程材料研究院有限公司,陕西西安710077 [2]油气钻采输送装备全国重点实验室,陕西西安710077 [3]陕西九州石油工程技术服务有限责任公司,陕西西安710075 [4]中国石油新疆油田分公司采油工艺研究院,新疆克拉玛依834000

出　　处：《新疆石油天然气》2024年第4期50-59,共10页Xinjiang Oil & Gas

基　　金：中国石油天然气集团有限公司科技项目“极端环境用耐蚀材料研发及作用机理研究”(2023ZZ11-02)。

摘　　要：封隔器作为CCUS驱油作业的重要工具,其胶筒的可靠性直接影响封隔器性能,为探索其在临界CO_(2)环境中的耐腐蚀性能,分别研究了丁腈橡胶(NBR)、氢化丁腈橡胶(HNBR)、氟橡胶(FKM)在模拟超临界CO_(2)环境中的耐腐蚀性和力学性能。高温高压腐蚀实验结果显示,实验后NBR胶筒质量增加最大(6.81%),HNBR胶筒质量增加最小(2.48%);NBR胶筒外径增幅最大(4.21%),HNBR胶筒外径增幅最小(2.65%);FKM材料拉伸强度降低幅度最大(66.85%),HNBR材料拉伸强度降低幅度最小(37.78%)。研究结果表明,环境温度和服役时间的增加可加快CO_(2)等腐蚀介质进入橡胶内部的速率,从而加剧橡胶交联网络的破坏,使其力学性能下降。氢化丁腈橡胶因内部不饱和双键等弱键的数量少于丁腈橡胶、键能高于氟橡胶的N-O键,其耐CO_(2)腐蚀能力要优于氟橡胶和丁腈橡胶,在超临界CO_(2)环境中性能相对稳定。因此宜选用氢化丁腈橡胶作为CO_(2)驱注入井封隔器的密封材料。Packers are important tools for CCUS flooding operations,and the reliability of packer rubber directly affects the packer performance.In order to explore the corrosion resistance of packer rubber in a critical CO_(2) environment,the corrosion resistance and mechanical properties of nitrile rubber(NBR),hydrogenated nitrile rubber(HNBR)and fluororubber(FKM)in a simulated supercritical CO_(2) environment were studied.The high temperature high pressure corrosion tests show that the largest mass increment after tests is observed in the NBR rubber(6.81%)and the least one in the HNBR rubber(2.48%).The NBR rubber is also found with the largest outside diameter(OD)increment(4.21%),and the HNBR with the smallest OD increment.The largest and lowest drops of tensile strength occur in the FKM and HNBR materials,respectively(66.85%and 37.78%).The results show that with the increasing service time and ambient temperature,the rate of corrosive media like CO_(2) entering rubber is accelerated,which aggravates the damage of the rubber crosslinking network and degrades the mechanical properties.Because weak bonds like unsaturated double bonds in HNBR are fewer than those in NBR,and the bond energy of HNBR is higher than that of the N-O bond of FKM,the stability of HNBR in supercritical CO_(2) is better than those of the other two.Therefore,HNBR is recommended to be used as sealing elements of packers in CO_(2) flooding injection wells.

关 键 词：CO_(2)驱油 封隔器胶筒 超临界CO_(2)环境 服役时间 耐CO_(2)腐蚀 CCUS 

分 类 号：TE357[石油与天然气工程—油气田开发工程]