DOWNHOLE VIBRATING DEVICE Russian patent published in 2020 - IPC E21B7/24 E21B28/00 

FIELD: mining.

SUBSTANCE: group of inventions relates to creation of flow pulsation and device for creation of flow pulsation for drill string. Downhole vibrating tool for a drill string comprises a pulse motor comprising a rotor having at least two helical teeth along the length of the rotor, and a stator surrounding the stator channel, wherein the stator has at least three helical teeth along the stator length, wherein rotor is arranged in stator channel and is made with possibility of nutation in stator, pulse valve assembly located downstream of pulse motor, comprising first valve disc, made with possibility of nutation with rotor, wherein the first valve disc comprises a plurality of first channels, a second valve disc located downstream of the first valve disc. Second valve disc contains multiple second channels, is rigidly connected to stator and rests against the first valve disk with formation of sliding seal. At least one of the first channels is in fluid communication with at least one of the second channels in all nutation positions of the first valve disc relative to the second valve disc. Plurality of first channels comprises at least one first radial outer axial channel formed in the first valve disc and at least one first radially inner axial channel formed in the first valve disc. Plurality of second channels comprises at least one second radially outer axial channel formed in second valve disc, and a plurality of second radially inner axial channels formed in the second valve disc. Each of the first and second valve discs has a central axis. Each of the first and second axial channels has a central axis. Each of radial external axial channels has central axis, which is located radially farther from central axis of its corresponding valve disc, than central axis of each of radially internal axial channels on same valve disc.

EFFECT: reduced friction between drill string and well shaft, increased rate of penetration, continuity of transfer and transfer of low axial load to bit along drill string.

13 cl, 17 dwg