PROCEDURE FOR CASING CEMENTING AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2014 - IPC E21B33/13 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to construction of oil and gas wells, in particular to procedures of casing cementing. Method of casing cementing includes treatment of the well bore, casing running, washing of the well with flush fluid, pumping of displacement fluid and cement slurry and their squeezing to annular space. Herewith, in order to increase cohesion of cement stone with the outer surface of the casing string and rock of the well surface during cement slurry preparation, a monoelectret with positive or negative charges is added to the slurry in a fine disperse state with weight up to 1%. The solution is mixed up thoroughly and squeezed to annular space. Thereafter the casing string at the well head is connected in respect to the monoelectret charge to positive or negative terminals of direct-current source with voltage of 10 - 24 V and withhold under voltage until cement stone hardens.

EFFECT: improving leak tightness of annular space.

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