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- W3213628733 abstract "The serious volume shrinkage of G-grade oil well cement during the hydration period and the initial stage of hardening will cause poor cementing quality at the first and second cementing interfaces, which will lead to annulus channeling and ultimately affect the normal production of the oil well. Therefore, we researched high-activity MgO composite expansive agent. By calcination of industrial MgO at different temperatures and then rapid cooling, we obtained MgO with different activities. We then analyzed the reactivity and microstructure of these samples and tested their effects on the volume shrinkage of cement slurry in the early stage of hydration. The experimental results showed that the activity of the sample calcined at 800°C for 1 hour then cooled rapidly is more suitable. After adding the expansive agent, the volume shrinkage rate of cement slurry can be minimized to only 0.95% after 10 hours, while the volume shrinkage rate of blank cement slurry can reach 4.02% after 10 hours. By compounding the calcined active MgO with CaO and UEA, the composite expansive agent M-AC is obtained. The evaluation results showed that M-AC expansive agent can make up for the insufficient expansion of cement after hardening, realize the volume shrinkage compensation of cement in the whole process of cementing, and improve the cementing quality." @default.
- W3213628733 created "2021-11-22" @default.
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- W3213628733 date "2021-11-13" @default.
- W3213628733 modified "2023-10-16" @default.
- W3213628733 title "Preparation of active MgO composite expansive agent and its effect on volume deformation performance of cement slurry during hydration" @default.
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- W3213628733 doi "https://doi.org/10.1080/15567036.2021.2002980" @default.
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