FIELD: well completion. SUBSTANCE: method includes drilling-in, running casing into well, and injection of cement mortar. Injected between portions of cement mortar is portion of viscoelastic compound with stable properties. It is provided above producing formation under condition that hydrostatic pressure of columns of overlying portion of cement mortal and portion of viscoelastic compound exceeding formation pressure is transmitted to lower elevation of viscoelastic compound. EFFECT: higher efficiency due to provision of improved sealing of casing string-borehole annulus.
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