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CCUS井工况下不同引晶材料对水泥石裂缝自愈合过程的影响

饶志华 邓成辉 马倩芸 武广瑷 武治强 程小伟

饶志华,邓成辉,马倩芸,等. CCUS井工况下不同引晶材料对水泥石裂缝自愈合过程的影响[J]. 钻井液与完井液,2023,40(4):495-501 doi: 10.12358/j.issn.1001-5620.2023.04.012
引用本文: 饶志华,邓成辉,马倩芸,等. CCUS井工况下不同引晶材料对水泥石裂缝自愈合过程的影响[J]. 钻井液与完井液,2023,40(4):495-501 doi: 10.12358/j.issn.1001-5620.2023.04.012
RAO Zhihua, DENG Chenghui, MA Qianyun, et al.Comparative study on effects of different crystallographic materials on self-healing of fractures in set cement under CCUS well work conditions[J]. Drilling Fluid & Completion Fluid,2023, 40(4):495-501 doi: 10.12358/j.issn.1001-5620.2023.04.012
Citation: RAO Zhihua, DENG Chenghui, MA Qianyun, et al.Comparative study on effects of different crystallographic materials on self-healing of fractures in set cement under CCUS well work conditions[J]. Drilling Fluid & Completion Fluid,2023, 40(4):495-501 doi: 10.12358/j.issn.1001-5620.2023.04.012

CCUS井工况下不同引晶材料对水泥石裂缝自愈合过程的影响

doi: 10.12358/j.issn.1001-5620.2023.04.012
基金项目: 中海油科技项目“CO2封存与利用钻采关键技术研究”(KJGG-2022-12-CCUS-0104 )。
详细信息
    作者简介:

    饶志华,高级工程师,1981年生,硕士研究生毕业于长江大学,现在主要从事海洋油气钻完井技术研究及管理工作。E-mail:raozhh@cnooc.com.cn

  • 中图分类号: TE256

Comparative Study on Effects of Different Crystallographic Materials on Self-healing of Fractures in Set Cement under CCUS Well Work Conditions

  • 摘要: 为了尽快实现碳中和的目标,二氧化碳捕获、利用和封存(Carbon Capture,Utilization and Storage——CCUS)技术不可或缺。由于CCUS高温高压的环境引起较大的应力和温度波动,水泥环易形成裂缝对CO2的安全封存造成威胁。以碳酸钙晶须和氧化石墨烯作为引晶材料诱导水泥石裂缝表面碳化结晶,并研究其对水泥石裂缝自愈合进程的影响。实验结果表明,经过碳化自愈合反应不同的龄期后,分别掺入碳酸钙晶须和氧化石墨烯水泥石的抗压强度均高于空白水泥石。μ-CT的结果分析表明,掺入碳酸钙晶须和氧化石墨烯的水泥石裂缝体积的自愈率分别为55.24%和74.60%,要高于空白水泥石的18.32%;水泥石裂缝表面物相分析表明,随着碳化时间的增加,掺入引晶材料水泥石裂缝表面的CaCO3晶体含量高于空白水泥石。由此说明碳酸钙晶须和氧化石墨烯作为引晶材料可提高水泥石裂缝在CCUS工况下的碳化自愈合能力。

     

  • 图  1  不同实验材料的微观形貌

    图  2  模拟高温高压水泥石碳化自愈合装置示意图

    图  3  水泥石试样碳化自愈合后抗压强度的变化

    图  4  水泥石试样碳化自愈合前(左)后(右)裂缝体积的变化

    图  5  碳化自愈合后水泥石试样裂缝表面XRD分析

    图  6  碳化自愈合后水泥石试样裂缝表面TG分析

    图  7  水泥石试样裂缝表面碳化自愈合前(左)后(右)微观结构变化

    表  1  G级油井水泥化学成分

    化学
    成分
    质量分
    数/%
    化学
    成分
    质量分
    数/%
    化学
    成分
    质量分
    数/%
    Na2O0.23CaO61.79Fe2O34.15
    Al2O33.37SiO220.38烧失量2.61
    MgO1.95K2O0.45其他5.07
    下载: 导出CSV

    表  2  水泥石碳化前后裂缝体积的变化率

    水泥石碳化前裂缝
    体积/mm3
    碳化后裂缝
    体积/mm3
    裂缝自愈率/
    %
    1*-S49.7840.0918.32
    2*-S48.5812.3474.60
    3*-S50.7422.7155.24
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-04-15
  • 修回日期:  2023-05-22
  • 刊出日期:  2023-07-30

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