METHOD OF WATER-PRODUCING WELL RECOVERY Russian patent published in 2015 - IPC E21B29/00 E21B37/06 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the oil and gas industry, and namely to the recovery of a water-producing well and in particular to the recovery of the water-producing well, which upper part is placed in a low-temperature clogged-up terrigenous reservoir close to permafrost rock. According to the method the lower water-producing part of the production string is liquidated. To this end a tubing string is withdrawn from the well. A permanent cement plug is set in the flow string. The upper unflooded part of the production string is perforated within the interval of low-permeable low-temperature terrigenous deposits located lower than the permafrost rock. The flow string is run down to the perforation interval. Acetone is injected in sequence in the volume of 1-2 m³ to the bottomhole zone of the low-temperature and low-permeable clogged-up terrigenous deposits per 1 m of the perforated thickness. Then aerated and dispersed aqueous solution of hydrogen peroxide is injected with concentration of less than 10-15 wt % in volume of 2-3 m³ per 1m of the perforated thickness. The aerated and dispersed aqueous solution of hydrogen peroxide is flushed to the low-temperature and low-permeable clogged-up terrigenous deposits by gas condensate with short-time withhold in production for the period of clay components peeling off from rock particles. A mixture consisting of the gas condensate, an aerated and dispersed aqueous solution of hydrogen peroxide and acetone with peeled off clay components of the rock are removed and extracted from the borehole. Then the borehole is developed by the delivery of an inert gas, for example, nitrogen, to it. The well is cleaned up and introduced into operation by makeup of the pre-set tuning string.

EFFECT: increased efficiency in the recovery of the water-producing well due to thereturn of its upper part into operation.

3 ex, 5 dwg