WELL KILLING METHOD Russian patent published in 2006 - IPC E21B33/13 

FIELD: oil and gas industry, particularly for well killing.

SUBSTANCE: method involves arranging isolation cement bridge in casing pipe over productive horizon; communicating casing string-borehole space with string space through technological opening located within the boundaries of high-plastic covering rock interval; arranging additional isolation cement bridge; forming artificial covering and water-tight isolation screen system. Additional cement bridge roof is 2-10 m below lower technological opening end. After casing string-borehole space communication with string space artificial isolation covering is created of material, which has composition as close as possible to that of rock located within interval of artificial isolation covering communication with string space. String space part defined by cement bridges is filled with viscoplastic material having density, which is 1.0-1.2 times greater than that of fluid-tight rock penetrated by well.

EFFECT: increased fluid-tightness of artificial covering and water-tight isolation screen system.

6 cl, 2 dwg, 1 ex, 4 tbl