- Sep 22, 2017 -
Can improve the thermal stability of oil well cement is due to the undensified silica fume contains more than 95% of the SiO2, its addition to change the cement C / S ratio, so that the composition of cement hydration products and structure has changed. Experiments show that in the presence of micro-silica fume, C3S particles around the existence of three different C / S suspected plastic, the innermost C / S is 115 or so, the outermost layer C / S less than 1. C / S different, the product structure is different, its performance is not the same. Eilers and others believe that in the addition of lime micro-silica fume in the cement, with the amount and the ambient temperature is different, can be a series of good thermal stability, high strength, low permeability hydration products. When the amount of micro-silica powder is about 35%, cement system C / S close to 1, such as the temperature is higher than 120 ℃, the main form of snow silicite, when the temperature is higher than 150 ℃, the main formation of xonotlite and A small amount of white calcium zeolite, they are stable within 400 ℃. In addition, the product of a small amount of calcium-calcium-magnesium zeolite, soda-lime stone, stakes and other cement on the thermal stability of a certain role, thus improving the high temperature performance of cement.
Undensified silica fume is active SiO2 as the main component of inorganic powder material, can be used as low-density cement slurry high temperature stabilizer. In the above cement slurry by adding 45% of the micro-silica fume, cement at 350 ℃, 20MPa for 3 days, the strength of 1211MPa.
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