Linear permanent magnet motor driven downhole plunger pumping unit

A method of pumping well fluid in a subterranean location, comprising:

• a. a downhole part of a pumping unit is fitted into a well bore, a plunger pump through its plunger reciprocation transmitted by a downhole linear motor slider through an extension bar draws oil-well fluid from the well bore through an at least one discharge valve and pushes the oil-well fluid to a flow tubing through an at least one non-return valve by means of a gravity gas separator;
• b. a ground-based control unit provides the downhole linear motor with three-phase AC power to generate a traveling magnetic field in a stator and provide for smooth reciprocating motion of the downhole linear motor slider;
• c. the plunger moves up—power stroke, during an upstroke, the oil-well fluid is pushed inside the pump barrel to the flow tubing through the at least one non-return valve;
• d. when the plunger moves down during a downstroke, the oil-well fluid is drawn from the well bore through the at least one discharge valve at a top of the pump.

A power consumption optimization system and method, comprising the following stages:

• a. a ground-based control unit receiving an oil-well fluid pressure and temperature parameters from a downhole telemetry unit to control an inflow of a transferred fluid in a well and changes an operating mode of a downhole linear motor to maintain a production rate;
• b. the ground-based control unit receives the temperature parameters of the downhole linear motor and the oil-well fluid from the downhole telemetry unit to control operating temperature of a downhole part and changes the operating mode of the downhole linear motor to maintain safe operating temperatures;
• c. the ground-based control unit determining a position of a slider and controlling, the operation of the downhoIe linear motor according to a cyclogram:
• an upstroke means a rated power consumption, and a downstroke means a minimum power consumption.