DOWNHOLE DEVICE AND METHOD Russian patent published in 2017 - IPC E21B23/08 E21B34/14 

FIELD: mining.

SUBSTANCE: device contains the housing, the catching device installed in the casing and containing one or more radially movable seat elements, with the ability to be installed from the opened configuration, in which the seat elements allow the object passing through the device, into catching configuration, in which the seat elements catch the object, passing through the device, the exhausting element in the casing, moving by means of the catching device between the fixing position, in which the exhausting element provides the catching device installation into the catching configuration by the seat elements radially fixing in the radial inner or retracted position, to the releasing position, in which the exhausting element provides the catching device installation into the catching configuration, removing the radial fixation of the seat elements, providing the seat elements radial moving outward, providing the discharge of the object caught before. The device housing forms the central channel and includes the fluid medium window and the valve element, moving from the closed position, in which the fluid medium window is blocking to the opened position, in which the window is opening.

EFFECT: reliability increase of the downhole device actuation in the required sequence for the formation processing.

29 cl, 47 dwg