MECHANICAL FORCE GENERATOR Russian patent published in 2019 - IPC E21B28/00 E21B7/24 E21B25/00 E21B4/16 E21B31/107 

FIELD: drilling of soil or rock.

SUBSTANCE: group of inventions relates to drilling. Mechanical force generator for use in a drill string comprises a rotary cam disc connected to oscillate a certain mass for indirectly providing vibrations to a drill pipe and / or a drill pipe casing. Cam disc has two opposite oblique bearing surfaces rotating with passage through the support. During rotation, two opposite oblique bearing surfaces deflect the support, resting against it, to generate longitudinal mass oscillations relative to the drill string and / or the casing of the drill string. Oscillations are transmitted to drill string and / or drill string casing. At that, the support contains opposite supports for resting opposite skewed bearing surfaces on them. At least one support is adjusted to follow the corresponding opposite support surface and maintain interaction.

EFFECT: provided are sinusoidal or close to sinusoidal oscillations at the output, sufficient to minimize friction and / or release of attached drill string, control of value of force and / or frequency with smooth or sharp correction from surface, possibility of operation under severe conditions of environment.

16 cl, 12 dwg