ABOUT THE INFLUENCE OF DOWNHOLE VIBRATION EFFECTS ON CEMENT STONE IMPERMEABILITY
The impermeability of a cement stone was experimentally studied under the effect of downhole vibration source. It is found that cement stone having a fractured-porous structure in the initial state retains it under static force action. When vibropulse effects occur in the local area of power contact during the first 10 hours of operation, the initial structure of microfractures is converted to a dynamic structure, and the proof-test pressure drop increases by 2-3 times. It is shown that the breakthrough of the liquid phase through the cement stone body does not occur at the standard pressure gradient, which ensures the absence of behind-the-casing flows of fluid and water due to the downhole vibration effect.