Hybrid effects of carbon nanotubes and nano-rubber on the mechanical properties and microstructure of oil well cement paste cured at different temperatures: Experimental studies and a micromechanical model

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Jiyun Shen , Yan Wang , Yongjin Yu , Pengcheng Fu , Mingliang Zhang , Longbang Qing , Rongwei Yang
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Abstract

A ductile oil well cement paste (OWCP) with lower autogenous shrinkage is of paramount importance to the integrity of cement sheath under downhole condition. Taking advantage of multiple experimental tests and a micromechanical model, the hybrid effects of nano-rubber (NR) and carbon nanotubes (CNTs) on the mechanical properties, autogenous shrinkage, hydration behavior and microstructure of OWCP were investigated in this study. Results show that the hybrid addition of NR and CNTs effectively enhances the mechanical properties and ductility of OWCP, 7-day tensile strengths of OWCP incorporated with 4 wt% NR and 0.04 wt% (N4C4) cured at 30 °C, 60 °C and 90 °C exhibit 1.4%, 13.7%, 13.0% strength gain with respect to those of plain OWCP (P) at the similar curing temperature; T/E ratios (tensile strength/Young’s modulus) of 7-day N4C4 cured at 30 °C, 60 °C and 90 °C exhibit 82.3%, 39.3% and 40.8% increase as compared to that of P at the similar curing temperature; the hybrid addition of NR and CNTs suppresses the autogenous shrinkage of OWCP, leading to about 31.9%, −12.8%, and 20.8% reduction of 72-hour autogenous shrinkage of OWCP at 30 °C, 60 °C and 90 °C, respectively. The developed micromechanical model is capable of well quantifying the hybrid effects of NR and CNTs on the mechanical/poroelastic properties of OWCPs. The present work is anticipated to shed light on the development of a ductile OWCP with lower autogenous shrinkage under harsh downhole conditions.
碳纳米管和纳米橡胶对不同温度下固化的油井水泥浆的力学性能和微观结构的混合效应:实验研究与微观力学模型
自生收缩率较低的韧性油井水泥浆(OWCP)对于井下条件下水泥护套的完整性至关重要。本研究利用多种实验测试和微观力学模型,研究了纳米橡胶(NR)和碳纳米管(CNTs)对 OWCP 的力学性能、自生收缩、水化行为和微观结构的混合影响。结果表明,混合添加 NR 和 CNTs 能有效提高 OWCP 的机械性能和延展性,在 30 ℃、60 ℃ 和 90 ℃ 下固化的含有 4 wt% NR 和 0.04 wt% (N4C4) 的 OWCP 的 7 天拉伸强度分别为 1.在相似的固化温度下,与普通 OWCP(P)相比,其强度分别增加了 4%、13.7% 和 13.0%;在 30 ℃、60 ℃ 和 90 ℃ 下固化 7 天的 N4C4 的 T/E 比(拉伸强度/杨氏模量)分别为 82.3%、39.3% 和 40.8%;NR 和 CNT 的混合添加抑制了 OWCP 的自生收缩,使 OWCP 在 30 ℃、60 ℃ 和 90 ℃ 下的 72 小时自生收缩率分别降低了约 31.9%、-12.8% 和 20.8%。所开发的微机械模型能够很好地量化 NR 和 CNT 对 OWCP 机械/波弹性特性的混合效应。本研究有望为开发在恶劣井下条件下具有较低自生收缩率的韧性 OWCP 提供启示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Cement & concrete composites
Cement & concrete composites 工程技术-材料科学:复合
CiteScore
18.70
自引率
11.40%
发文量
459
审稿时长
65 days
期刊介绍: Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.
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