SUBSTANTIATION OF THE POSSIBILITY OF USING WASTE IN THE TECHNOLOGY OF OIL WELL CEMENT

Abstract

The characteristics of cement cement are considered on the basis of the influence of the environment in which it is used. Cement cement should be characterized by the necessary strength in the first two days of hardening. The strength of the hardened cement mortar in the short period of hardening should ensure the consolidation of the column in the wellbore, its necessary stability during drilling and perforation, effective isolation from permeable rocks. The influence of the composition of phase clinker on the properties of cement cement, the influence of additives to improve its physico-chemical characteristics, the characteristics of the formation of cement stone during hydration are considered. The effect of the water-cement ratio on the rate of hardening is quite significant. With a constant phase composition of clinker, a reduced water content leads to a more rapid formation of the necessary supersaturation of the solution and the appearance of “cramped” conditions, and, consequently, to an acceleration of the setting time of the solutions. Thus, the analysis of the applied cement compositions shows that their expansion mainly occurs due to an increase in the volume of cement hydration products. Expansion occurs when the environment of the growing crystal is solid phase or liquid in closed pores. The values of expansion and self-stress are determined by the strength and plasticity of the hardening structure. Comparison of operational characteristics indicates the possibility of replacing part of the cement clinker with chemical industry waste. The introduction of chromite and ferritic additives into the structure of cement clinker improves its physicochemical characteristics, and many industrial enterprises produce wastes that, by their chemical composition, can be used as feedstock in the production of binders for special purposes with a set of specified properties. The disposal of such wastes will not only improve the ecological situation, but also save natural resources. Since for many gas-bearing regions, high temperatures in wells are characteristic, the development of cement cements with elevated operating temperatures is urgent, which requires the introduction of heat-resistant phases into the cement composition.