METHOD FOR SELECTIVE ISOLATION OF PRODUCTIVE BED AT CEMENTATION OF PRODUCTION STRING Russian patent published in 1999 - IPC

FIELD: oil, gas, and water recovery industry. SUBSTANCE: according to method, casing string is lowered into bore-hole which is provided with device for isolation of productive bed. Aforesaid device is positioned against productive bed. Viscous-resilient mixture is injected into interval against productive bed prior to or after lowering of casing string. After that, column of viscous-resilient mixture is fixed against productive bed. Subsequent cementation is carried out through by-pass passage of device and through annular space of bore-hole. Application of aforesaid method for selective isolation of productive bed is prominent for its high efficiency during cementation of production string and for simplified technology in isolation of any number of productive beds in bore-hole at any depth of their lying in bore-bole. EFFECT: higher efficiency. 1 dwg