METHOD FOR BOTTOM-HOLE ZONE TREATMENT Russian patent published in 2012 - IPC E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: method includes casing string mounting in the well, determination of geological, physical and chemical properties of rocks of productive formation and formation fluids, treatment of bottom-hole zone of productive formation via pumping of first and second chemical reagents, well holding for the time of chemical reagents reaction with the rocks of productive formation and formation fluids, cleaning of formation bottom-hole zone from reaction products at putting the well on production. According to the invention to intensify the inflow the osmotic water is removed from the formation bottom-hole zone and rock pore space is hydrophobisated. For this purpose 50% methanol solution is pumped as first reagent and left for reaction, after that reaction products are forced through inside the formation. Note that the second reagent is used for further hydrophobisation of bottom-hole zone and its gas permeability is increased. For this purpose water solution of surface active agent in concentration 1-3% is used. Reaction products are extracted from productive formation together with formation gas at well development that is done with the use of well-donor gas or inert gas.

EFFECT: increase of formation bottom-hole zone treatment efficiency.

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