USE OF SILICON PRODUCTION WASTES AS ADDITIVES IMPROVING THE PROCESS PROPERTIES OF THE CEMENT SLURRIES

Abstract

The relevance of the study is caused by the need to solve the problem of annular pressure arising in the cemented annulus of wells. The problem attracts close attention of oil and gas companies and scientists, because such a complication creates a situation of environmental pollution. This can lead to disruption of well operation, formation of gryphons, explosions and fires. Currently, many oil and gas companies face such problems as the phenomenon of annulus pressures in the cemented well annulus. Such a complication creates a situation of technogenic accumulations of fluid in the wellhead part of the well itself and in the lowlands of the relief of the day surface of nearby territories, including in water bodies. During the entire «life» of the well, starting from the stage of initial opening of oil and gas reservoirs, channels can be formed that contributes to the occurrence of interlayer crossflows, up to 40 % of all wells put into operation have such a marriage. The problem is especially acute when cementing under conditions of low hydrodynamic pressures and low temperatures, in unstable fractured rocks. The main aim: to investigate and determine the possibility of using waste produced by RUSAL ITC LLC as a modifying additive to insulation mixtures used in conditions characteristic of deposits in Eastern Siberia. Object: grouting solution based on cement PCT I-G-CC-1 used in the fields of Eastern Siberia. Methods: instrumental methods for determining the parameters of cement mortars for plugging wells according to GOST 26798.1-96 and GOST 310.3-76, processing the results and their evaluation in accordance with GOST R 8.736-2011. Results. The authors studied and described the physico-chemical characteristics of condensed silica MK-65 and MK-85, gave a descriptive characteristic of Portland cement of the grouting type PCT I-G-CC-1, prepared grouting mixtures with the addition of tight-fitting additives MK-65 and MK-85, carried out the comparative studies of the prepared solutions according to technological parameters at a temperature of 22 °C. It is established that the use of microsilicon MK-65 and MK-85 allows reducing such indicators as density, water separation and filtration of grouting solution, with an increase in the strength indicators of the stone. The results of the study showed a significant improvement in the technological parameters of the grouting solution (stone). The use of this substance without increasing the density of the solution significantly reduces such indicators as water separation and filtration of grouting solution, as well as increases the strength indicators of cement stone.

Keywords

• portland cement
• plugging mortar
• cement stone
• microsilica
• strength
• water separation
• filtration