HYDRAULIC VIBRATOR Russian patent published in 2003 - IPC

FIELD: devices for vibration treatment of oil wells. SUBSTANCE: hydraulic vibrator has body in which tension spring is secured with the help of bushing. Tension spring is closed by plug to form airtight cavity inside spring. Pressure built-up by fluid flow in cavity of tension spring, compressed in normal state to tight contact of it coils, overcomes its elasticity. Spring is stretched and spiral gap opens between spring coils for fluid outlet. Pressure in spring cavity drops and elastic force compresses spring back to initial position. Spring coils abruptly close up and fluid flow from coil cavity is discontinued. Abrupt ceasing of fluid flow results in hydraulic impact. Then pressure is built-up in spring cavity, and cycle is repeated. EFFECT: simplified design, reduced pressure losses in vibrator, higher reliability of operation in contaminated fluid. 1 dwg