The paper presents cement slurries with adjustable kinetics of expansion that were selected based on previously carried studies. An effect of expansion additives on linear expansion of cement stone were studied on two temperature modes 22 ºC and 75 ºC. Cement compositions setted in water and air conditions. The concentration of expansion additive changed in a range of 3 to 8 % of oil well cement mass. Analysis of obtained experimental data shows direct dependency of expansion from amount of additive; indirect dependency of expansion from temperature; linear expansion in air conditions is lower, than in water. An analysis of experiments results showed that the best results were obtained with addition of mixture CaO /Atren Light in the air at 22 °C. Expansion was up to 4.3% with an additive of 8 %.All mixtures showed consistently good expansion in water at 22 °C, which is achieved with addition of 3 to 4 % of expanding additive. However, with small addition of the additive of 3%, the greatest expansion was achieved with the CaO / Atren Light formulation. In water media CaO/Atren Light recipe had again the best results at 75 °С. With 8 % of concentration CaO/Atren Light recipe gives 5.5 % in linear expansion.
In order to casing oil and gas wells on high level of quality it is recommended to use cement slurries with expanding additives CaO/Atren Light and CaO/CSAM-2M. Its concentration depends on well conditions and varies between 3 to 8 %. Based on carried studies cement slurries with adjustable kinetics of expansion were developed. They are intended to be used in casing of oil wells under conditions of normal and moderate temperatures.
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