WELL BOTTOM ZONE TREATMENT METHOD

FIELD: oil industry, particularly methods for stimulating production. ^ SUBSTANCE: method involves forcing solution of acid and surfactant in productive formation zone; exercising technological time-delay and providing differential pressure drawdown. The solution is obtained by solving surfactant, namely chromium acetate-based surfactant, heated up to 80-90°C and highly concentrated hydrochloric acid in distillated water to reduce hydrochloric acid concentration up to 5-20%. The solution is injected at temperature of 30-70°C. Volume of the solution is enough to heat flow string to temperature providing mudding member melting, that is not less than 0.8 m3/m of productive formation. The solution if formed by light-weight oil having flow rate of 24-35 m3/day under initial pressure of 0.8-1.5 MPa at flow string head. The time delay is carried out for not more than 2 hours. Differential pressure drawdown is performed by swabbing operation when hole annuity is packed to obtain well bottom pressure drawdown of not less than 3 MPa. ^ EFFECT: increased efficiency of well bottom zone treatment. ^ 1 ex