METHOD OF WATER PRODUCTION RESTRAINT IN WELL Russian patent published in 2009 - IPC E21B33/138 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil industry, particularly to methods of water production restraint in producing and pressure wells. The method consists in successive pumping and driving spacer fluid and working fluid, in pumping spacer fluid into grout pipes, the lower end of which is located above the zone of inlet of these components into a reservoir and in conditioning in the reservoir for a period required for working fluid solidification. After the first spacer going out beyond the bottom of the grout pipes into annular space an annular gate is closed and working fluid is pumped into the reservoir with minimal consumption to a maximum pressure for a production string; then residues of working fluid are flushed with a backflow using for this purpose spacer fluid collected beyond the bottom of the grout pipes in annular space.

EFFECT: increased stability of insulating barrier, decreased cost for working fluid preparation and minimising emergencies at back flow flushing.

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