SUBMERSIBLE LOW-SPEED DIRECT-DRIVE PUMPING PLANT Russian patent published in 2007 - IPC F04B47/00 F04C2/107 

FIELD: oil producing and construction industry.

SUBSTANCE: invention relates to electric machine building and it can be used at designing of submersible plants using as low speed drive of rodless submersible pumps, mainly screw pump, oil-filled synchronous electric motors. Proposed submersible low-speed direct-drive pumping plant for producing formation fluid has control station, three-phase ac supply source and submersible electric pumping unit lowered into well on tubings and consisting of electric motor with hydraulic protections whose windings are connected into star. Pump and cable line. Pump is made in form of screw machine, and electric motor, in form of synchronous electric motor with salient-pole stator, outer surface of poles being either smooth or provided with radial teeth, no-winding rotor on outer surface of which radial teeth are made. Identical inductive windings connected into phases are wound on poles of stator. Each consists of two parallel arms, each including series-connected diode and windings. Diodes in parallel arms are connected, in opposition, and phases are connected through cable line conductors to ac sine voltage source. Diodes are connected into assembly arranged in submerged part of plant to provided possibility of use of three-wire cable line to supply voltage to electric motor.

EFFECT: simplified design of plant, improved efficiency of oil production and reliability in operation.

4 cl, 2 dwg