ISOLATION METHOD OF WATER INFLUX TO WELL Russian patent published in 2011 - IPC E21B33/138 C09K8/467 

FIELD: oil and gas industry.

SUBSTANCE: isolation method of water influx to well involves pumping via tubing string to water influx interval of isolation compound, gelling agent and cement solution, technological exposure and development of well. Isolation compound contains the following, wt %: sodium silicate with silica module 2.6-5.0 4-20, water-soluble polymer 0.05-0.3, and fresh water is the rest. Water solution (10-15%) of chlorhydric acid in quantity of 0.5-5.0% of compound volume is used as gelling agent for isolation. Gelling agent is pumped separately after isolation compound is pumped and pumping is performed in cycles. During the first 1 to 3 cycles there used is aerated isolation compound and gelling agent; in next cycles there used is non-aerated isolation compound and gelling agent; then, cement mortar is pumped and process exposure is performed.

EFFECT: increasing efficiency of isolation works.

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