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SUBMERSIBLE PUMPING APPARATUS, COMPRISING LINEAR ELECTRIC MOTOR AND DOUBLE ACTION PUMP

10/09/2019

1. A submersible pumping apparatus comprising, in a single housing, a linear electric motor comprising a fixed part in the form of a sealed stator filled with a dielectric liquid comprising a three-phase winding with mounted temperature sensors, and a movable part being slider, wherein the movable part comprises several sections that are spaced apart in a circumferential direction of the stator, configured to reciprocate relative to the stator, and have a mechanical connection with plungers of pumps; one of the pumps is located in the inner cavity of the stator, the second pump is located in the bottom part of the apparatus in the inner cavity of a hydro-protector; pump cylinders comprise hydraulic dampers of the stroke end points; working chambers of the pumps are interconnected and have a connection with an external environment through filters, located on both sides of the stator, and a suction valve, and with an outlet manifold through a check valve and a unit for attachment of an oil-well pumping apparatus to a tubing string; slider guides made of an antifriction material and position sensors are mounted on both sides of the stator; mounted in the bottom part, a telemetry system comprises pressure and temperature sensors for a borehole fluid, a vibration sensor, an inclinometer, a measuring unit connected to the temperature sensors mounted in the electric motor stator, and the telemetry system is connected to a main surface control unit via the neutral point of the electric motor windings.
 
 

2. A method for lifting fluid from a well, comprising:

(a) mounting a submersible portion of a pumping apparatus into a wellbore, wherein the plunger pumps, by reciprocating the plungers, due to the force transmitted from linear motor sliders, intake a wellbore fluid from the annular space of the well through a gas separator and eject the wellbore fluid through the double-action valves to a tubing string;
(b) feeding three-phase alternating power by a main surface control unit to the electric motor to form a traveling magnetic field in the stator and provide a smooth synchronous reciprocating motion of the slider;
(c) during the working stroke upwards, intaking the wellbore fluid from the annular space of the well through a suction valve located in the bottom part of the apparatus, and ejecting the wellbore fluid into the tubing string by the plunger of an upper plunger pair when a pressure valve is closed;
(d) during the working stroke downwards, ejecting the wellbore fluid into the tubing string with the plunger of a lower plunger pair and filling the working volume of a cylinder of the upper plunger pair through the pressure valve of the second pump when the suction valve of the lower plunger pair is closed.
 
 
 
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