DOWNHOLE PULSATOR Russian patent published in 2015 - IPC E21B43/25 E21B28/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular, to devices used for formation simulation. Device for hydropercussion simulation of the formation included into the assembly of flow string comprises a hydraulic cylinder with crossover shoe, a plunger with radial openings, a spring-actuated pusher with circular bore and a ring piston. At that the hydraulic cylinder is fixed rigidly to a chamber with a landing ring installed in it and longitudinal grooves at its outer side. The pusher is equipped with outside protrusion, a saddle and a ball valve in the axial channel. The pusher lower end is passed to the axial channel of the landing ring and equipped with a locking ring interconnected with the pusher by a shear pin. The chamber axial channel is covered from below by a thrust ring and equipped with a hollow rod with the end valve pressed by a spring to the landing ring. At that in the end valve body there is a bore with a loose locking ring installed in it and the plunger is equipped with a ring piston thus forming an annular gap with the hydraulic cylinder coupled hydraulically to annular space by bypass ports.

EFFECT: improved efficiency of hydropercussion simulation of the formation.

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