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The efficiency of insulating permeable zones between pipes and beyond them mainly depends on properly designed slurry. Significantly, the requirements for cement slurries are mainly conditioned by the number of tripped casing columns, geological-technical conditions, design of the well and its designation. Cement slurries to be used for sealing boreholes in definite geological-technical conditions have specific physical properties, e.g. density, filtration, lack of shrinking during hydration. The cement sheath made of such slurry should have appropriate mechanical parameters and be impervious to gas. However, when sealing directional and horizontal boreholes attention should be paid to considerably stricter regimes for slurry parameters, i.e. sedimentation stability, water settling (free water) and the filtration of slurry. These are the most important parameters determining the usability of slurry for sealing directional boreholes [2, 10, 13, 18]. The number of additional factors influences this situation by directly improving the sedimentation stability of cement slurry, i.e. one of the most important factors contributing to efficient sealing of directional and horizontal boreholes.

The influence of anti-sedimentation agents on the technological parameters of cement slurry