METHOD OF HYDROMECHANICAL PUNCHING OF WELLS ON DEPRESSION Russian patent published in 2017 - IPC E21B43/114 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil and gas industry, to drilling and well operations, namely to methods for secondary completion and treatment of production formations. The method of hydromechanical perforation of wells on depression is characterized in that the lowering into the production string of of the jet pump, the packer and hydromechanical punching perforator attached to the tubing string is performed, the packer is installed in the tubing string with subsequent opening of the production string by supplying under pressure into the perforator of the working fluid with formation of perforations, the erosion cavities by injection of the working fluid into the formed perforations through the jetting channels of perforator punches is performed, the colmatant is extracted from the PZP by creating of depression by the jet pump in the below-packer space. The production casing is opened in two stages. At the first stage, the process perforations are formed without erosion cavities. At the second stage, the perforations are formed through which cavities are eroded, simultaneously with that the jet pump creates the depression in the under-packer space and colmatant is extracted through the process perforations.

EFFECT: invention improves the efficiency of jetting conditioning of reservoir and reduce the time for development of the well dure to the creation of vast cavern in the bottomhole formation zone with guaranteed extraction of colmatant from it.

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