Scholarlink

<p>Underground hydrogen storage (UHS) in the geological subsurface is a promising alternative technology to overcome constraints related to fluctuations in renewable energy sources and a new determination to net zero carbon. One of the crucial parameters for long-term UHS in the subsurface pertains to well integrity. Injection of hydrogen into the subsurface can lead to cement-hydrogen interaction which can lead to the alteration of cement rock petrophysical properties. Therefore, effective cement nature is essential for understanding and evaluating hydrogen and cement reactions. The current experimental research analyses the application of multi-welled carbon nanotubes (MWCNTs) geopolymer cement as a key step toward carbon neutrality, for long-term subsurface hydrogen storage. The physical and chemical experimental investigation of scanning electron microscope (SEM), Unconfined compressive strength (UCS), Acoustic velocity (AC), Shear bond strength (SBS), porosity (poro), permeability (perm), X-ray diffraction (XRD) under 9.65&#xa0;MPa and 60°c were performed. The findings revealed that MWCNT-FGC2 samples containing geopolymer cement after maximum curing from 3 to 28&#xa0;days demonstrated an increase in unconfined compressive bond strength from 34.12 to 47.06&#xa0;MPa in contrast to ordinary Portland cement (OPC) which was from 36.23 to 43.07&#xa0;MPa respectively and shear bond from 0.24 to 0.358&#xa0;MPa during all curing times as a result of the geopolymerization and nucleation reaction of MWCNT geopolymer. In relation to that, minor reactivity of hydrogen with nano-geopolymer cement, with low alteration of cement petrophysical properties which favor UHS was observed. Likewise, the XRD findings depicted an increment in elite concentration after the addition of MWCNT geopolymer that promoted the production of N–A–S–H gel, that led increase in UCS and SBS strength. Moreover, acoustic velocity indicated a rise in young modulus and a minor increase in the poisonous ratio, proposing low risk in well integrity during the UHS process. The SEM image showed a needle-like structure declaring the presence of MWCNT geopolymer in the matrix, suggesting the increase of wellbore integrity for UHS. The study revealed that a new cement system can enhance the mechanical property resulting in wellbore integrity, reduction of CO<sub>2</sub> emissions, and elaborated clearly on the reaction between cement and hydrogen during the injection time, and proposed that nano-geopolymer improves well integrity hence favoring the UHS process and net-zero carbon emission in the environment.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Application of nano-geopolymer on well integrity for potential underground hydrogen storage from the experimental study: a step toward net-zero carbon emissions

  • 期刊论文

  • 发表日期：

    2026年2月8日

查看全文
  • Edwin E. Nyakilla,
  • Sun Guanhua,
  • Hao Honglian,
  • Li Dan,
  • Ma Huimin,
  • Yu Xianyang,
  • Nafouanti Mouigni Baraka,
  • Emanuel X. Ricky,
  • Hassain Waqas,
  • Abubakar Magaji,
  • Athumani Omari Mbuji,
  • Makungu M. Madirisha

摘要

Underground hydrogen storage (UHS) in the geological subsurface is a promising alternative technology to overcome constraints related to fluctuations in renewable energy sources and a new determination to net zero carbon. One of the crucial parameters for long-term UHS in the subsurface pertains to well integrity. Injection of hydrogen into the subsurface can lead to cement-hydrogen interaction which can lead to the alteration of cement rock petrophysical properties. Therefore, effective cement nature is essential for understanding and evaluating hydrogen and cement reactions. The current experimental research analyses the application of multi-welled carbon nanotubes (MWCNTs) geopolymer cement as a key step toward carbon neutrality, for long-term subsurface hydrogen storage. The physical and chemical experimental investigation of scanning electron microscope (SEM), Unconfined compressive strength (UCS), Acoustic velocity (AC), Shear bond strength (SBS), porosity (poro), permeability (perm), X-ray diffraction (XRD) under 9.65 MPa and 60°c were performed. The findings revealed that MWCNT-FGC2 samples containing geopolymer cement after maximum curing from 3 to 28 days demonstrated an increase in unconfined compressive bond strength from 34.12 to 47.06 MPa in contrast to ordinary Portland cement (OPC) which was from 36.23 to 43.07 MPa respectively and shear bond from 0.24 to 0.358 MPa during all curing times as a result of the geopolymerization and nucleation reaction of MWCNT geopolymer. In relation to that, minor reactivity of hydrogen with nano-geopolymer cement, with low alteration of cement petrophysical properties which favor UHS was observed. Likewise, the XRD findings depicted an increment in elite concentration after the addition of MWCNT geopolymer that promoted the production of N–A–S–H gel, that led increase in UCS and SBS strength. Moreover, acoustic velocity indicated a rise in young modulus and a minor increase in the poisonous ratio, proposing low risk in well integrity during the UHS process. The SEM image showed a needle-like structure declaring the presence of MWCNT geopolymer in the matrix, suggesting the increase of wellbore integrity for UHS. The study revealed that a new cement system can enhance the mechanical property resulting in wellbore integrity, reduction of CO2 emissions, and elaborated clearly on the reaction between cement and hydrogen during the injection time, and proposed that nano-geopolymer improves well integrity hence favoring the UHS process and net-zero carbon emission in the environment.