The problem of providing repair and insulation works with technical means for the preparation of small volumes of grouting solutions is relevant due to the annual expansion of repair work carried out on the old fund of wells of gas and oil fields that are at the final stage of development. In the Krasnodar Territory alone, more than 1,000 borehole operations with the preparation of grouting solution are performed annually at oil and gas fields. A characteristic feature of repair and insulation works at the gas and oil fields of the region is the high density of agricultural land and objects of the resort and recreational territory, which place particularly high demands on the environmental safety of work, quality and equipment of specialized enterprises. In such conditions, the issues of improving the technical base of the repair and maintenance of local oil and gas industry enterprises become very relevant, including this applies to the technical means of preparing grouting solutions. The authors have developed new equipment: a mobile complete block for the preparation of grouting solutions with a volume of up to 3 m3, including a hydro-ejector mixer, a cement supply system for mixing, a built-in averaging tank, a dispersant. Tests were performed on a mixer with a mixing chamber made in the form of a confuser and a hydraulic mixer having a cylindrical mixing chamber. Calculations of the main parameters of the block were performed: hydro-ejector mixer, grouting solution supply line, mechanical agitator. Full-scale tests of flow cavitation dispersants and rotary pulsation ones developed by the authors were carried out. Comparative results of strength measurements of cement stone obtained by traditional and new technology using dispersants are presented. According to the analysis of the results of all field and laboratory tests, the use of dispersants allowed to increase the homogeneity of the solution and its spreadability; to reduce the water separation of the grouting solution, to increase the strength limit of the cement stone for bending and compression. The decrease in water separation causes a decrease in the number and geometric characteristics of channels in cement stone, which are the cause of many complications both during construction and during well operation: the presence of intercolonial pressures, interplastic flows; the formation of secondary technogenic deposits, griffins, etc.
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