METHOD FOR WELL BOTTOM ZONE TREATMENT Russian patent published in 2007 - IPC E21B43/27 

FIELD: oil industry, particularly methods for stimulating production by forming crevices or fractures by use of eroding chemicals.

SUBSTANCE: method involves flushing well with oil; regenerating productive reservoir perforation in amount of at least 5 orifices per 1 meter; injecting 1.5-2.0 m3 of hydrochloric acid solution in reservoir; holding the process under bath conditions for 2.5-3.5 hours; performing pulsed injection of the first hydrochloric acid solution portion with predetermined volume and in preset regime; carrying out injection of the second hydrochloric acid solution portion; holding the process in continuous regime; performing time delay; carrying out injection of the third hydrochloric acid solution portion in continuous regime under 1-4 MPa pressure; executing time delay; carrying out injection of the forth hydrochloric acid solution portion in predetermined regime; performing time delay and removing reaction product by swabbing operation.

EFFECT: increased efficiency of well bottom zone treatment.

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