Cementing Using Nano Silica for High Temperature and High Pressure Geothermal Wells

Abstract

Recently, nanoparticles are getting popular and are being used in various fields to produce new materials which are of great use due to their special properties. This paper briefly refers about the effect of nano silica on various properties of cement. The HTHP conditions have poor effect on the cement causing decrease in its strength and increase of permeability so the use of nano silica becomes very essential as they work well under HTHP conditions. Due to high reactivity of nano silica is highly effective in improving the slurry impermeability, mechanical properties and rheological properties of a material. Nano silica also affects the setting time of the cement. In cement matrix because of nano silica the porosity and permeability were reduced up to a great extent and it also helps in increasing the compressive strength. Cements which were designed using these nano silicate structures have minimum permeability among all the other ones, which were made using different methods.