RECONDITIONING UNIT OF WELL SCREEN (VERSIONS) Russian patent published in 2008 - IPC E21B43/08 

FIELD: mining.

SUBSTANCE: unit contains a submersible pumping unit fixed on a lift pipe, a percussive exciter of screen reconditioning fitted with a container of residue harvesting, a submersible short-circuit motor, a cable, a rope, a spring hanger and skids. The percussive exciter of screen reconditioning is made in the form of a balance weight located on a flexible shaft, which is connected by means of flanged joint with a longish lower end of the motor rotor shaft. The electric motor is linked to a variable frequency drive located at the mouth of a well and connected thereto by means of a cable. The variable frequency drive is capable of controlling rotary speed of the balance weight ensuring resonance oscillations of exciter-screen string system. Alternatively, the exciter can be made in the form of a camshaft connected with its lower end to a clutch installed in plain bearings with spring-actuated thrusters. The latter are arranged inside the housing; a container of residue harvesting is installed above. Additionally, a container of residue harvesting equipped with blade-type mill is arranged under the electric motor.

EFFECT: increased output of a well and enhanced level of screen reconditioning.

2 cl, 8 dwg