Volume 37 Issue 6
Dec.  2020
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GENG Chenzi, YAO Xiao, DAI Dan, LI Xuenian, JIANG Tao, YAN Lianguo, WU Xuechao. Effects of Physical Properties of SiO2 Crystalline State on Mechanical Properties of High Temperature Set Cement[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(6): 777-783. doi: 10.3969/j.issn.1001-5620.2020.06.017
Citation: GENG Chenzi, YAO Xiao, DAI Dan, LI Xuenian, JIANG Tao, YAN Lianguo, WU Xuechao. Effects of Physical Properties of SiO2 Crystalline State on Mechanical Properties of High Temperature Set Cement[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(6): 777-783. doi: 10.3969/j.issn.1001-5620.2020.06.017

Effects of Physical Properties of SiO2 Crystalline State on Mechanical Properties of High Temperature Set Cement

doi: 10.3969/j.issn.1001-5620.2020.06.017
  • Received Date: 2020-06-25
  • Publish Date: 2020-12-28
  • The decline of the high temperature mechanical properties of set cement in oil wells has significant influences on the safety of deep reservoirs and the life span of the wells. Studies on the decline patterns of set cement’s high temperature strengths help to improve the long-term high temperature mechanical properties of the set cement. Silica leaching, one of the important factors leading to the decline of cement’s high temperature mechanical properties, has not yet been taken seriously. In this study, the effects of temperature on the solubility of different crystalline silicas have been investigated, and the compressive strength of the set cement with sand at elevated temperatures analyzed. It was proved that the solubility of silica increases with increase in temperature, and the solubility of non-crystalline silica is much larger than the solubility of crystalline silica. With the increase in the solubility of silica, the dissolution of silica in the early stage of hydration promotes the development of the early-stage high temperature compressive strength of the set cement. In the late stage of the high temperature reaction, silica leaching takes place in the hydration products, resulting in decline of the high temperature strength of the set cement. The high temperature compressive strength of set cement in static water is higher and more stable than the high temperature compressive strength of set cement in dynamic water. A high silica saturation in a curing environment helps make the high temperature mechanical properties of set cement more stable. Based on the analysis of silica leaching at high temperatures, it was found that treatment of cement slurries with sand comprising mainly crystalline silica and minor content of non-crystalline silica help improve the stability of high temperature mechanical properties of the set cement.

     

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