Compressive Strength and Hydration Products of Oil Well Cement Mixed with Fly Ash at Ultra-high Temperature
Source abstract
Abstract
The compressive strengths and hydration products was investigated of oil well cement mixed with fly ash at ultra-high temperatures. Cured at 150°C, the strength for test samples with 30% and 50% fly ash was relatively high in the early days but declined in subsequent days. However, the samples with 70% fly ash showed a continuous trend. The compressive strengths were relatively high at 28 days, and all the samples met the cementing requirements at this temperature. At 220°C, the mix with 30% fly ash had the least compressive strength, while that of 70% fly ash content was comparatively high. X-ray diffraction analysis shows that the main crystalline hydration products at 150°C were tobermorite and hibschite. At 220°C, tobermorite decomposes into xonotlite because it has limited high temperature stability. The pozzolanic reaction of fly ash and portlandite Ca(OH)2 produced a comparatively stable phase known as hibschite. The scanning electron microscopy analysis shows that the surface morphology of tobermorite is fibrous while hibschite is vitreous. Both compounds have high strength characteristics due to their structural interconnectedness. Xonotlite crystal is coarse and plate-shaped with poor bonding, which negatively impacts its strength stability. Due to the presence of hibschite, cement mix with high amounts of fly ash is suitable for application at 220°C.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Concrete and Cement Materials Research · Drilling and Well Engineering · Building materials and conservation
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, and Sinopec Research Institute of Petroleum Engineering, Beijing 102206 China.
References (20)
Show source-provided references
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