METHOD OF TREATMENT OF BOTTOMHOLE ZONE OF WELL, EQUIPPED WITH PACKER Russian patent published in 2008 - IPC E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to mining and can be used for development and rejuvenation of producing wells yield, reduced as a result of mudding of a bottomhole zone with asphalt-tar-paraffin formations and mechanical additives. The method of treatment of a bottomhole of a well, equipped with a packer, includes formation of a depressive pressure drop between the bottomhole zone and a reservoir of the well. A shock wave, relocating in the well reservoir, creates recurrent pressure impulses in the bottomhole zone; the said wave occurs with alternate opening of the well reservoir at the mouth of the well for well fluid under pressure flowing out, and with its closing by means of valves. One of these - the fluid discharge valve - connects the well reservoir with a discharge reservoir; the second - the fluid refill valve - connects the well reservoir with the fluid source under pressure. The discharge reservoir is connected with a pump and compressor pipe (PCP) via the fluid discharge valve. The fluid source under pressure is connected with an annular space via the fluid refill valve. A back-pressure valve, connecting the reservoir of PCP with the annular space and directing the flow of fluid from the annular space into the PCP reservoir, is installed above the packer. Fluid pumping into PCP up to a process acceptable level is performed via the annular space and the back pressure valve. Flushing-out of the valve is carried out through the annular space, the back pressure valve and PCP.

EFFECT: maintaining of sufficient pressure in the oil well reservoir and avoiding of impurities transfer in the PCP reservoir to the bottomhole zone.

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