WATER JET TOOL FOR BOTTOMHOLE CLEANING Russian patent published in 2021 - IPC E21B37/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, in particular to devices for cleaning and flushing the bottom of a well with compacted sand and/or proppant plugs. The device includes a cylindrical body with a cavity, an end cutting tool and a thrust ring equipped with hydromonitor channels for erosion of the plug and hydraulic communication of the cavity of the cylindrical body with the borehole space. Above the cylindrical body is attached to the string of flushing pipes. The lower end of the end cutting tool is equipped with serrated notches, the thrust ring is rigidly fixed in the lower part of the cylindrical body and is equipped with a central channel for backwashing and eccentrically located jetting channels located at different distances from the central axis of the cylindrical body. The central channel from above is equipped with a landing seat on which the cone is installed, and inside the body opposite the cone there are centralizers with overflow channels. A travel stop is rigidly installed in the body above the centralizers, which allows limiting the axial movement of the cone with the possibility of opening the central channel of the cylindrical body when backwashing the well.

EFFECT: efficiency of the jetting action on the plug is increased, the quality of washing the sand washed out at the bottomhole and the rate of erosion of the compacted plug are increased, and the duration of work on cleaning the bottomhole is reduced.

1 cl, 4 dwg