抗CO_(2)腐蚀特种树脂水泥体系的构建及其性能评价  

Construction and performance evaluation of CO_(2) resistant special resin cement system

作　　者：王瑞 陈神根 徐金山 周振杰 谢鑫鑫 郑存川[2] WANG Rui;CHEN Shen-gen;XU Jin-shan;ZHOU Zhen-jie;XIE Xin-xin;ZHENG Cun-chuan(China Petroleum Xinjang Oilfield Branch Engineering Technology Research Institute,Karamay 834000,China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中国石油新疆油田分公司工程技术研究院,新疆克拉玛依834000 [2]西南石油大学化学化工学院,四川成都610500

出　　处：《化学研究与应用》2025年第2期344-352,共9页Chemical Research and Application

基　　金：四川省重点研发项目(2021YFG0112)资助;中国博士后科学基金项目(2018M631100)资助。

摘　　要：针对CO_(2)腐蚀套管及水泥环造成的油气井,油田常用的G级水泥堵漏配方不能满足抗CO_(2)腐蚀需求,造成水泥环失去封隔作用,导致环控窜流等工程问题。本文选择了一种特种树脂乳液,利用其柔性紧密填充的作用,提高水泥石防腐蚀能力。首先通过宏观抗压强度测试和微观形貌测试相结合的方式,阐明了特种树脂相比其他刚性颗粒对水泥颗粒具有明显的填充优势,然后对主要添加剂种类及添加量的优选,构建了一套密度为1.82 g/cm^(3),流动度为27 cm,能够注入3~4 mm孔缝,60℃下FLHTHP为31.18 mL的高密实抗CO_(2)腐蚀的树脂水泥浆体系。树脂水泥石性能测试结果表明在5 MPaCO_(2)/60℃下腐蚀28天后,抗压强度相比基础水泥的衰退率(19.05%~25.93%)树脂水泥石仅为-2.93%~5.54%,渗透率增长率为由基础水泥石的330.56%~455.56%降低到7.45%~180.40%,胶结强度增长了41.54%~59.95%,表明该树脂水泥体系抗CO_(2)腐蚀性能较优。最后,通过SEM、热重分析了树脂的加入填充了水泥石的孔隙,增大了水泥石的密实性,有效阻挡了CO_(2)进入水泥石内部,以此提高了水泥石的抗腐蚀能力。For oil and gas wells caused by CO_(2)corrosion of casing and cement sheath,the commonly used G-grade cement plugging formula in oil fields cannot meet the requirements of CO_(2)corrosion resistance,causing the cement sheath to lose its sealing effect and leading to engineering problems such as environmental control channeling.In this paper,a special resin lotion is selected to improve the corrosion resistance of cement paste by its flexible and compact filling function.Firstly,a combination of macroscopic compressive strength testing and microscopic morphology testing was used to elucidate the significant filling advantages of special resins over other rigid particles in cement particles.Then,the main types and amounts of additives were optimized,and a high-density and CO_(2)resistant resin cement slurry system with a density of 1.82 g/cm^(3),a flowability of 27 cm,and the ability to inject 3-4 mm pores was constructed.The FL_(HTHP)at 60℃was 31.18 mL,which is resistant to CO_(2)corrosion.The performance test results of resin cement stone show that after 28 days of corrosion at 5 MPaCO_(2)/60℃,the compressive strength of the resin cement stone declines compared to the base cement(19.05%~25.93%),and the decline rate is only-2.93%~5.54%.The permeability growth rate is reduced from 330.56%~455.56%of the base cement stone to 7.45%~180.40%,and the bonding strength increases by 41.54%~59.95%,indicating that the resin cement system has better CO_(2)corrosion resistance.Finally,SEM and thermogravimetric analysis showed that the addition of resin filled the pores of the cement stone,increasing its compactness and effectively blocking CO_(2)from entering the interior of the cement stone,thereby improving its corrosion resistance.

关 键 词：树脂水泥 CO_(2)腐蚀 液相腐蚀 

分 类 号：O614.4[理学—无机化学]