碳纳米管羧基功能化及其对水泥石的影响

贾慧; 金鑫; 魏浩光; 李小江

doi:10.12358/j.issn.1001-5620.2024.05.011

碳纳米管羧基功能化及其对水泥石的影响

doi: 10.12358/j.issn.1001-5620.2024.05.011

贾慧^{1, 2,},
金鑫^{1, 2},
魏浩光^{1, 2},
李小江^{1, 2}

1.
中国石化固井与完井重点实验室，北京102206
2.
中石化石油工程技术研究院有限公司，北京102206

基金项目: 国家自然科学基金“复杂环境下水泥环全生命周期密封理论与控制方法”（U22B6003）。

详细信息

作者简介:
贾慧，助理研究员，博士，1994年生，毕业于中国地质大学（武汉）材料科学与工程专业，现在从事固井液技术研究工作。E-mail：jiah19790.sripe@sinopec.com

中图分类号: TE256
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- 被引次数: 0
出版历程
- 收稿日期: 2024-04-15
- 修回日期: 2024-06-02
- 刊出日期: 2024-11-07

Carboxyl Functionalized Carbon Nanotube and Its Effects on Set Cement

JIA Hui^{1, 2
,},
JIN Xin^{1, 2},
WEI Haoguang^{1, 2},
LI Xiaojiang^{1, 2}

1.
Sinopec Key Laboratory of Cementing and Completion, Beijing 102206
2.
Sinopec Research Institute of Petroleum Engineering Co., Ltd., Beijing 102206

摘要

摘要: 随着非常规油气井开发的不断深入，复杂的地下环境对水泥石的各项力学性能指标提出更高的要求，因此，急需开发高性能的纳米材料用于改造水泥石性能。采用稀酸酸化工艺制备羧基功能化碳纳米管分散液，通过接触角、紫外-可见吸收光谱和沉降稳定性等测试对分散液的分散能力进行讨论，并对羧基功能化碳纳米管提高水泥石力学性能的效果进行了验证。研究结果表明，羧基功能化可使碳纳米管的粒径减小89.71%，并使疏水材料转变为亲水材料，同时，羧基功能化碳纳米管在水中的分散稳定性提升100%；0.005%加量的羧基功能化碳纳米管使水泥石的抗压强度提高16.05%，抗折强度提高25.82%，抗拉强度提高18.07%。
- 碳纳米管 /
- 羧基 /
- 水泥石
Abstract: With the continual development of unconventional oil and gas, complex downhole conditions have presented higher requirements on the various mechanical properties of set cement for well integrity, and these requirements have urged the development of high performance nanomaterials for improving the performance of the set cement. In this study, a carboxyl functionalized carbon nanotube dispersion was developed through dilute-acid acidization process. The dispersibility of the dispersion was measured by means of contact-angle measurement, UV-visible absorption spectroscopy as well as settling stability measurement etc., and the effect of the carboxyl functionalized carbon nanotube on improving the mechanical properties of set cement was verified. The study shows that carboxyl functionalization reduces the diameters of the carbon nanotube particles by 89.71%, and can convert a hydrophobic material to hydrophilic one. Carboxyl functionalization also improves the dispersion stability of the carbon nanotube by 100%. A cement slurry treated with 0.005% carboxyl functionalized carbon nanotube has the compressive strength of the set cement increased by 16.05%, the flexural strength by 25.82%, and the tensile strength by 18.07%.
- Carbon nanotube /
- Carboxyl /
- Set cement

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图 1 碳纳米管的XRD图谱

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图 2 碳纳米管的FTIR红外光谱

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图 3 碳纳米管Zeta电位对比图

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图 4 羧基功能化碳纳米管在不同pH值环境中的Zeta电位对比图

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图 5 碳纳米管的SEM图

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图 6 羧基功能化碳纳米管的SEM图

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图 7 碳纳米管粒径对比图

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图 8 接触角对比图

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图 9 羧基碳纳米管紫外-可见吸收光谱图

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图 10 最大吸收波长处吸光度对比图

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图 11 静置沉降稳定性对比图

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表 1 水泥石力学性能比较

名称	配方	抗压强度/ MPa	抗折强度/ MPa	抗拉强度/ MPa	渗透率/ mD
水泥石	800 g G级水泥+32 g DZJ-180T+320 g水	35.27	7.28	4.87	0.0100
羧基碳纳米管水泥石	800 g G级水泥+32 g DZJ-180T+320 g水+ 40 mg羧基碳纳米管	40.93	9.16	5.75	0.0084

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表 2 羧基碳纳米管水泥石力学性能随养护时间变化比较

t_养护/d	抗压强度/MPa	抗折强度/MPa	弹性模量/GPa
1	27.60	5.22	7.2
2	40.93	9.16	8.3
3	42.43	9.38	8.2
5	46.20	9.59	8.3
7	48.05	9.67	8.3

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