Volume 39 Issue 2
Jun.  2022
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2022  >  39(2): 221-226
GUO Hua, MA Qianyun, WU Zhiqiang, et al.Research on the effect of blast furnace slag on low-temperature hydration characteristics and high-temperature mechanical properties of aluminate cement[J]. Drilling Fluid & Completion Fluid，2022, 39（2）：221-226 doi: 10.12358/j.issn.1001-5620.2022.02.015
Citation: GUO Hua, MA Qianyun, WU Zhiqiang, et al.Research on the effect of blast furnace slag on low-temperature hydration characteristics and high-temperature mechanical properties of aluminate cement[J]. Drilling Fluid & Completion Fluid，2022, 39（2）：221-226 doi: 10.12358/j.issn.1001-5620.2022.02.015
shu

Research on the Effect of Blast Furnace Slag on Low-temperature Hydration Characteristics and High-temperature Mechanical Properties of Aluminate Cement

doi: 10.12358/j.issn.1001-5620.2022.02.015
  • 1.

    CNOOC Research Institute Co., Ltd., Beijing 100028

  • 2.

    Engneering Technology Research Institute, BHDC, Tianjin 300451

  • 3.

    Downhole Services Company BHDC，Renqiu，Hebei 062552

  • Received Date: 2021-10-01
  • Accepted Date: 2021-12-16
  • Rev Recd Date: 2021-12-06
  • Publish Date: 2022-06-23
    Abstract
  • Well cementing operation is now faced with more complex working conditions such as high temperature, high pressure and acidic environment in oil and gas exploration and development, demanding higher quality cement sheath. Silicate cement, because of its mineral composition and hydrational products, is easy to get corroded in acidic environment, resulting in failure of the cement sheaths to seal the annular spaces behind the casing string. Compared with silicate cement, the aluminate cement modified with blast furnace slag has properties that are more satisfactory, for example, it has better high-temperature resistance, long durability, and higher resistance to acid corrosion, as well as low cost and wider applicability. The corrosion resistance of the blast furnace slag modified aluminate cement was studied in simulated working conditions of high temperature high pressure offshore operation. The strength development and corrosion resistance mechanisms of the blast furnace slag modified aluminate cement were revealed by characterizing the mineral composition and micromorphology of the set cement before and after corrosion. It was found that addition of 40% blast furnace slag helps the aluminate cement retard its late-stage strength deterioration and improve its corrosion resistance. Microscopic analyses showed that the tricalcium aluminate hexahydrate (C3AH6) is produced directly from the main mineral component CA (calcium aluminate) of the aluminate cement, thereby avoiding the reaction of C2AH8 (dicalcium aluminate octahydrate) and CAH10 (calcium aluminate decahydrate) with the blast furnace slag to produce C2ASH8 (calcium aluminosilicate hydrate), a mineral having loose structure and low strength. The production of large amount of C3AH6 results in a set cement with much denser structure, reducing the number of channels through which acidic fluid can flow and greatly enhancing the mechanical property and corrosion resistance of the blast furnace slag modified aluminate cement.

     

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