METHOD OF RIMOSE HYDROSAND-BLAST PERFORATION Russian patent published in 2018 - IPC E21B43/119 E21B43/25 

FIELD: oil production industry.

SUBSTANCE: invention relates to oil-and-gas industry, and also to the field of operation of underground waters by water wells. For the implementation of the method of slotted hydro-sandblast perforation, the locations of cuts are determined, the hydro-sandblast perforating machine with the pressure testing assembly is put into the well, the abrasive fluid is supplied to the perforating machine, at least one cut is perforated in two modes, the channels of the jet nozzles of the perforating machine are closed, the well is washed and the hydro-sandblast perforating machine with the pressure testing assembly is lifted. Location of the cuts is determined in accordance with the direction of the maximum stress lines of the rocks. Prior to descending into the well between the testing assembly and the perforating machine, the orientation unit is mounted on the same axis as the perforating unit. Orientation of the resulting assembly is carried out after it is lowered into the well and before carrying out the perforation, which is carried out by descending the gyroscopic inclinometer tool into the attitude reference assembly and mounting it coaxially with the attitude reference assembly. By means of the gyroscopic inclinometer tool, the position of the jet nozzles in space is determined, the angle of the required rotation of the perforating machine is determined, in which the plane that passes through the axes of the two opposing nozzles, will be located along the lines of maximum stress of the rocks. Tubing string with the perforating machine is rotated to this angle.

EFFECT: increased efficiency of hydro-sandblast perforation is provided.

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