METHOD FOR HORIZONTAL WELL BOTTOM ZONE INTERVAL TREATMENT Russian patent published in 2006 - IPC E21B43/27 

FIELD: oil industry, particularly methods for stimulating production with the use of eroding chemicals.

SUBSTANCE: method involves injecting acid solution in well bottom zone intervals beginning from remote interval to nearest vertical well bore through flow string. During particular interval treatment flow string end is moved towards interval to be treated. Acid solution and aqueous emulsifier solution are injected in each interval to be treated at rate of 24-35 m³/day and under flow string head pressure of 0.8-1.5 MPa. Then 3 hour technological time-delay is carried out and swabbing operation is performed to reach differential pressure drawdown at well bottom of not less than 3 MPa.

EFFECT: increased efficiency of acid well bottom zone treatment.

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