Scholarly record
NANOSILICA AS AN ADDITIVE FOR CEMENT SLURRIES USED IN DRILLING WELLS UNDER HIGH TEMPERATURE AND HIGH-PRESSURE CONDITIONS
Abstract
The mining industry is often faced with great difficulty in drilling deeper and deeper holes in the search for oil and gas. This results in constantly increasing costs and the continuing need to create better materials and technologies to reduce possible losses. Drilling technology must cope with high temperatures and pressures in the hole and other unfriendly environmental conditions. Increasing demands on the properties of the slurry and cement stone force the search for unconventional solutions and materials that will definitely improve their properties and resistance to temperature and chemical agents in difficult geological and mineral conditions. Materials with the properties needed to meet these challenges are close to nanomaterial technologies, which are still used in the petroleum industry to a very small extent. Incorporating nanoparticles into cement slurries can improve their functionality and improve their technological parameters. The cement stone is composed of small grains of hydrated calcium silicate gel and large crystals of hydrated hydration products, which contain nanopores and capillary pores. This is ideal for nanoparticles to improve the properties of the cement grout. Deep hole cementation requires the addition of special material in the cement grout to counteract compressive strength degradation, and the n-silica addition reduces the intensity of the decrease in strength - it transforms the CSH phase into tobermorite, giving the cement a high compressive strength and low permeability, loss of fluids and strength regression, also results in a significant increase in compressive strength of the cement mix. This is ideal for nanoparticles to improve the properties of the cement grout. Comparative analysis executed by the author showed that using suitable quantities of SiO2 nanoparticles, it would be possible to design a cement slurry with good rheological properties, high strength and low filtration capacity.
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