DOWNHOLE HYDRAULIC VIBRATOR Russian patent published in 2000 - IPC

FIELD: oil- and gas-producing industry. SUBSTANCE: downhole hydraulic vibrator has body accommodating stem with central axial channel made in the form of widening diffuser nozzle and slits. Installed coaxially to stem is valve with slits made at an angle to element but in opposite direction to stem slits. Stem and valve are installed in body on individual rolling bearings. Body is plugged from bottom and provided with radial holes. Installed against radial holes in body is conical deflector. Axial channel in the form of diffuser ensures higher amplitude of pulse pressures, and conical deflector increases energy value transmitted to formation. EFFECT: intensified oil recovery or water injection. 2 cl, 2 dwg