| 摘要: |
| 目的 通过制备一种亲水型环氧树脂基（E-54）弹性颗粒，以解决掺入现有弹性材料引起的水泥石强度降低的问题。方法 采用端羧基液态丁腈橡胶（CTBN）和纳米SiO2对E-54进行改性，制备得到了一种弹性树脂颗粒（E-RP），并通过傅里叶变换红外光谱、接触角、紫外光谱、XPS、扫描电镜和单轴压缩等手段研究了E-RP的化学组成、亲水性、分散性、微观结构和力学性能。结果 E-RP与水的接触角为54.5°，与水泥浆具有良好的相容性；CTBN与部分环氧基团成功反应，柔性链段的引入使E-RP具有更强的弹性形变能力，E-RP的压缩弹性模量较纯树脂降低了47.9%；E-RP的掺入会略微降低水泥浆的流动性，提高水泥石的抗压强度以及荷载下的形变能力。与空白水泥石相比，含质量分数为4%的E-RP颗粒水泥试样的弹性模量降低了37.5%。结论 E-RP能在水泥基体中保持良好的分散性和界面结合，从而缓解水泥石强度的衰退；E-RP能通过自身弹性变形和与水泥基体的脱黏消耗荷载能量，有效降低水泥石脆性，最终提升固井质量。 |
| 关键词: 油井水泥 弹性模量 环氧树脂 端羧基液态丁腈橡胶（CTBN） 纳米SiO2 |
| DOI：10.3969/j.issn.1007-3426.2025.02.013 |
| 分类号: |
| 基金项目:中国石油川庆钻探公司科研项目“耐温150 ℃固井用弹性水泥浆体系研发”（CQXN-2022-09） |
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| Study on reducing the brittleness of oil well cement by CTBN and nano-SiO2 modified epoxy resin particles |
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Haibing YAN1,2, Xiaofeng ZHANG3, Qiyang ZHAO1,2, Min CHEN1, Chengjin ZHANG1,2, Qing SHI1
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1.Chuanqing Drilling Engineering Co., Ltd. Downhole Operation Company, CNPC, Chengdu, Sichuan, China;2.Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu, Sichuan, China;3.College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, Sichuan, China
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| Abstract: |
| Objective A new hydrophilic epoxy resin-based elastic particle is prepared to solve the problem of the strength decline of cement stone caused by the incorporation of existing elastic fillers. Method A new type of elastic resin particle (E-RP) was prepared by modifying epoxy resin with liquid nitrile butadiene rubber (CTBN) and nano-SiO2, and the chemical composition, hydrophilicity, dispersibility, microstructure and mechanical properties of E-RP were studied through Fourier transform infrared spectroscopy, contact angle, ultraviolet spectroscopy, XPS, scanning electron microscopy and uniaxial compression. Result The contact angle between E-RP and water was 54.5°, which had good compatibility with cement slurry, and the successful reaction of CTBN with some epoxy groups and the introduction of flexible segments made E-RP have higher elastic deformation ability, and the compressive elastic modulus of E-RP was reduced by 47.9% compared with pure resin. The addition of E-RP would slightly reduce the fluidity of cement slurry, and improve the compressive strength of cement stone and the deformation ability under load. Compared with the blank cement stone, the elastic modulus of the cement sample containing 4 wt% E-RP particles was reduced by 37.5%. Conclusion E-RP can maintain good dispersibility and interfacial bonding in the cement matrix, thereby alleviating the strength decline of cement stone, and E-RP can consume load energy through its elastic deformation and debonding with the cement matrix, effectively reducing the brittleness of cement stone and ultimately improving the quality of well cementing. |
| Key words: oil well cement elastic modulus epoxy resin carboxyl-terminated butadiene acrylonitrile (CTBN) nano-SiO2 |
