DEVICE FOR PRODUCING HYDRAULIC PRESSURE PULSES IN WELL (VERSIONS) Russian patent published in 2002 - IPC

FIELD: devices for treatment of formations in producing and water-injection wells. SUBSTANCE: device has driving unit made in the form of screw gyro-rotor mechanism. Its stator has internal screw teeth, and rotor has external screw teeth for engagement with stator teeth. Number of stator teeth exceeds that of rotor by unit. Rotor axis is displaced relative to stator axis by value of eccentricity. There are bearing unit and flow interrupter which includes stator plug with hole for liquid passage and gate connected with rotor. Bearing unit is made in the form of planetary bearing which includes thrust bearing having at its ends supporting members in the form of circular projections with conical end surfaces and supporting members. Said members are connected with rotor and have form of circular projections with conical end surfaces for engagement with supporting members of thrust bearing. According to the second version of the device, planetary bearing includes upper and lower thrust bearings whose ends have supporting members on ends facing each other. EFFECT: extended process potentialities of device and its possible use in direct and reverse circulation. 8 cl, 8 dwg