METHOD FOR WATER INFLUX ZONE ISOLATION INSIDE WELL Russian patent published in 2008 - IPC E21B33/13 

FIELD: oil and gas production industry, particularly methods or devices for cementing, for plugging holes, crevices, or the like.

SUBSTANCE: method involves lowering injection pipes in isolation zone; serially injecting two plugging composition components in injection pipe string up to total passage of the first component into hole annuity; mixing plugging composition components inside well bore along with injection pipe string lifting and the second component displacement from the string; forcing the obtained plugging composition into interval to be isolated. The method is realized with the use of coiled tubing plant. The second plugging composition component is displaced into well bore through hydromonitor nozzle under pressure exceeding liquid column pressure in flexible pipe. Flexible pipe lifting speed and displacement liquid flow rate are set so that as hydromonitor nozzle reaches upper level of plugging composition column (determined from plugging covolume of composition components) in well bore the second component is fully displaced from flexible pipe.

EFFECT: increased efficiency of water influx zone isolation.

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