IMPACT RELEASING TOOL OF VARIABLE INTENSITY, ACTUATED BY SELECTED PRESSURE Russian patent published in 2020 - IPC E21B31/00 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to methods and devices for releasing stuck drill string. Method comprises providing a funnel-shaped element having opposing first and second surfaces, connected by a fluid flow path, having convergent funnel, which opens on first surface and is connected to narrow neck, which opens on opposite second surface, providing at least one deformed ball, each of which, in a non-deformed state, has a size such that the ball is held within the funnel, lowering the funnel-shaped element into an underground position inside the tubular string; lowering one of the deformable balls into the landing position within the funnel, increasing the fluid medium pressure inside the tubular string, until deformed ball is deformed and pushed through narrow neck of funnel-shaped element, fast release of compressed fluid medium through narrow funnel-shaped element, shaking tubular string, when the ball is pushed out through the narrow neck of the funnel-shaped element. Tubular columns with which the tool can be used can be formed from a drill pipe, a composite pipe or a system of pipes wound into a coil. Rapid outlet of fluid medium causes severe shaking or vibration of tubular string or lower equipment of drill string.

EFFECT: preventing breakage of drilling pipes, unauthorized start-up of the device, improving reliability and adjustability, avoiding the need for preliminary installation of the device.

8 cl, 26 dwg