DAMPING PULSATOR OF FLUID FLOW IN WELL Russian patent published in 2012 - IPC E21B28/00 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: damping pulsator of fluid flow in a well includes one-sided hydraulic cylinder. The latter includes composite sleeve, connecting head with a seal and bottom with a through groove. The sleeve comprises elastic element, guide stock and power piston with cup-type seals, which tightly separates stock and piston cavities of the sleeve, and drain small-section channels are made in its lower part. In addition, hydraulic cylinder includes screw mechanism consisting of lead screw and mating thread in through groove of the bottom, and stepped support with through holes, which is arranged in the sleeve between elastic element and upper edge of lead screw. Guide stock is partially made as hollow and provided with possibility of being interconnected with stock cavity of the sleeve. Bypass small-section hole is made in the wall of upper part of sleeve. Through holes connecting the stock cavity of the sleeve to the well shaft are made in middle part of the sleeve. Besides, through holes have the possibility of being equipped with water jet and cavitation head pieces.

EFFECT: improving reliability of the device adjustment, which is aimed at damping of hydraulic impacts.

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