Volume 40 Issue 4
Jul.  2023
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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
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Comparative Study on Effects of Different Crystallographic Materials on Self-healing of Fractures in Set Cement under CCUS Well Work Conditions

doi: 10.12358/j.issn.1001-5620.2023.04.012
  • 1.

    CNOOC Shenzhen Company, Shenzhen, Guangdong 518052

  • 2.

    Engineering Technology Research Institute BHDC, Tianjin 300450

  • 3.

    CNOOC Research Institute Co., Ltd., Beijing 100028

  • 4.

    School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan 610500

  • Received Date: 2023-04-15
  • Rev Recd Date: 2023-05-22
  • Publish Date: 2023-07-30
    Abstract
  • To achieve the goal of carbon neutrality as soon as possible, carbon capture, utilization and storage (CCUS) is an indispensable technology. High temperature high pressure environment in CCUS operations causes large stress and temperature fluctuations which in turn result in fractures in cement sheaths. These fractures in cement sheaths are a threat to the safe sequestration of CO2. To deal with this problem, calcium carbonate whisker and graphene oxide are used as crystallographic materials to induce carbonization crystallization on the surface of the fractures developed in set cement, and the effects of the crystallographic materials on the self-healing of the fractures in the set cement were studied. Experimental results show that after different periods of carbonization self-healing reaction, the compressive strengths of the set cement samples from cement slurries treated with calcium carbonate whisker and graphene oxide separately are all higher than the compressive strength of the blank set cement sample. μ-CT results show that the set cement samples containing calcium carbonate whisker and graphene oxide have percent self-healing of the volume of the fractures of 55.24% and 74.60%, respectively, higher than the percent self-healing of the volume of the fractures in the blank set cement sample, which is only 18.32%. Phase analyses of the substances at the surfaces of the fractures in the set cement samples show that as the time for the carbonization increases, the CaCO3 crystal contents at the surfaces of the fractures of the set cement samples containing crystallographic materials are higher than that of the blank set cement sample. From the experiment results it can be seen that the calcium carbonate whisker and the graphene oxide can be used as crystallographic materials to improve the carbonization self-healing ability of the fractures in cement sheath under CCUS work conditions.

     

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