PULSE WASHING DEVICE Russian patent published in 2003 - IPC

FIELD: oil and gas producing industry, particularly, devices for washing of sand bridges out of wells. SUBSTANCE: pulse washing device has body with tangential inlet and outlet channels, nozzle in outlet channel and centralized rotor installed for free rotation in body. Rotor has alternating recesses and projections engageable with fluid flow. Slots are formed in inlet and outlet tangential channels between body and rotor due to displacement of said channels. Displacement of intake channel is larger than that of outlet channel. Slot flow area of tangential inlet channel is larger than that of tangential outlet channel to provide for rotor turning due to action of fluid flow in outlet channel onto rotor projections. EFFECT: higher efficiency of breakage of sand bridges in wells due to increased force of impact of fluid jet flowing from nozzle at constant hydraulic capacity of pump supplying washing fluid into well. 2 cl, 3 dwg