Reasons for Improving the Thermal Stability of Oil Well Cement by undensified silica fume

- Sep 22, 2017 -


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Reasons for Improving the Thermal Stability of Oil Well Cement by undensified silica fume

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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