Volume 42 Issue 5
Sep.  2025
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GAO Fei, REN Meng, GUO Yucheng, et al.Geopolymer cement slurry system for CCUS/CCS wells[J]. Drilling Fluid & Completion Fluid，2025, 42（5）：665-671 doi: 10.12358/j.issn.1001-5620.2025.05.013
Citation: GAO Fei, REN Meng, GUO Yucheng, et al.Geopolymer cement slurry system for CCUS/CCS wells[J]. Drilling Fluid & Completion Fluid，2025, 42（5）：665-671 doi: 10.12358/j.issn.1001-5620.2025.05.013
shu

Geopolymer Cement Slurry System for CCUS/CCS Wells

doi: 10.12358/j.issn.1001-5620.2025.05.013
  • 1.

    The First Cementing Branch of CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062552

  • 2.

    School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580

  • 3.

    College of Chemistry and Chemical Engineering of Xi'an Shiyou University, Xi'an, Shaanxi 710065

  • Received Date: 2025-04-12
  • Rev Recd Date: 2025-05-20
  • Publish Date: 2025-09-30
    Abstract
  • Conventional silicate cement in CCUS/CCS wells is easy to be corroded by the high concentration of CO2, resulting in cement strength deterioration and failure of sealing in annular spaces. To deal with this problem, a low-carbon geopolymer cement slurry was developed. This cement slurry was formulated with solid wastes such as fly ash and slag as the basic materials, and a controlled-release activator produced by the reaction of sodium oxalate and Ca(OH)2 was used in the cement slurry to replace the commonly used NaOH. This new cement slurry has adjustable thickening performance and strong resistance to corrosion. The rheology and the corrosion resistance of the cement slurry are optimized with carefully selected additives. Experimental results show that this cement slurry, with its density being 1.85 g/cm3, has controllable thickening time at temperatures between 70℃ and 120℃, 24 h compressive strength of 40 MPa and elastic modulus of 6.5 GPa. After corrosion by CO2 for 30 d, the strength of the set cement does not decline, and the permeability of the set cement increases only by 9%. Five CCUS wells were cemented with this cement slurry, and the job quality all met the standards. The results of this study provide new ideas and engineering practice bases for optimizing the well cementing system used in a highly corrosive environment.

     

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