DOWNHOLE DEVICE AND WELL SYSTEM Russian patent published in 2020 - IPC E21B23/01 E21B34/14 

FIELD: drilling of wells.

SUBSTANCE: present invention relates to downhole device for downward movement in well by means of fluid medium to facilitate action on well production zone, the well comprising a well tubular structure having a first opening and a first movable coupling disposed opposite the first opening, wherein the tubular structure of the well has an inner diameter, wherein the downhole device has an axial length and comprises: a first portion comprising two extending members having a profile corresponding to the grooves in the coupling and a second portion comprising: a housing, two anchor elements configured to extend from the housing for anchoring the second portion in the tubular structure of the well, and a sealing member, made with possibility of sealing relative to well tubular structure, wherein downhole device additionally comprises: shifting mechanism comprising piston, made with possibility of movement inside cylinder of piston for displacement, in axial length of first part relative to second part, when it is anchored in tubular structure of well, to actuate coupling. Invention also relates to a well system for influencing a formation surrounding a tubular structure of a well. Present invention relates to a method of action on the formation impact by means of the well system according to the invention.

EFFECT: disclosed are well device and well system.

15 cl, 18 dwg