A system and method for enhanced magnet wire insulation is described. A method of making an enhanced magnet wire insulation suited for an electric submersible motor application includes drawing copper magnet wire to size, cleaning the copper magnet wire, pulling the copper magnet wire through a polyimide wrap machine to produce wrapped copper magnet wire and placing the wrapped copper magnet wire around a spool, heating the wrapped magnet wire by unspooling the wrapped magnet wire through a tube comprising an induction coil, removing moisture from the heated, wrapped copper magnet wire by creating at least a partial vacuum inside the tube, redrawing the wrapped copper magnet wire through an extrusion mold after moisture is removed, applying molten PEEK to the wrapped copper magnet wire to produce enhanced magnet wire, and winding the enhanced magnet wire into an induction motor to be used to operate an electric submersible pump.

A blower can be positioned in a wellbore. The blower rotatably drives or is driven by a fluid produced through the well bore. An electric machine can be positioned downhole of the blower, the electric machine configured to rotatably drive or be driven by the blower. A bearing shaft couples the blower and the electric machine. The bearing shaft transfers rotation between the blower and the electric machine. A passive magnetic radial bearing assembly magnetically supports the bearing shaft.

A blower can be positioned in a wellbore. The blower rotatably drives or is driven by a fluid produced through the well bore. An electric machine can be positioned downhole of the blower, the electric machine configured to rotatably drive or be driven by the blower. A bearing shaft couples the blower and the electric machine. The bearing shaft transfers rotation between the blower and the electric machine. A passive magnetic radial bearing assembly magnetically supports the bearing shaft.

Various implementations include electric centrifugal pump assemblies for producing oil from wells. A submersible electric motor includes a housing, a shaft inside said housing that transmits rotational power from the electric motor section to the pump section, a mechanical seal surrounding the shaft to keep a dielectric fluid inside the electric motor, and a unit for compensating the volume of the dielectric fluid. Said unit maintains a constant positive pressure and includes a spring mounted inside a metal bellows. The spring is arranged in a tensioned state inside a cavity containing dielectric fluid. The spring is rigidly fastened facing the electric motor and to the bottom of the bellows such as to be capable of axial movement. The volume compensation unit is provided with a sensor for sensing the position of the spring/bellows. The cavity is filled with a barrier fluid preventing scale build up.

Various implementations include electric centrifugal pump assemblies for producing oil from wells. A submersible electric motor includes a housing, a shaft inside said housing that transmits rotational power from the electric motor section to the pump section, a mechanical seal surrounding the shaft to keep a dielectric fluid inside the electric motor, and a unit for compensating the volume of the dielectric fluid. Said unit maintains a constant positive pressure and includes a spring mounted inside a metal bellows. The spring is arranged in a tensioned state inside a cavity containing dielectric fluid. The spring is rigidly fastened facing the electric motor and to the bottom of the bellows such as to be capable of axial movement. The volume compensation unit is provided with a sensor for sensing the position of the spring/bellows. The cavity is filled with a barrier fluid preventing scale build up.

A method for manufacturing a motor lead cable includes the steps of forming one or more motor leads and placing external armor around the one or motor leads. The step of forming each of the one or more motor leads includes providing an insulated conductor, providing an open capillary tube that has opposing sides that have not been joined together, placing the insulated conductor inside the unclosed capillary tube, approximating the sides of the unclosed capillary tube around the insulated conductor, and welding the sides of the capillary tube together to form a closed capillary tube around the insulated conductor.

A method comprises operating an electric submersible pump (ESP) motor downhole in a well. The ESP motor is electrically connected to a variable speed drive (VSD) proximate to the well. The operating comprises measuring a revolution rate and a motor current of the ESP motor for a first period of time and performing a first adjustment of a voltage output of the VSD. The method comprises measuring, after the first adjustment, the revolution rate and the motor current of the ESP motor for a second period of time determining a difference between the motor current measured for the first period of time and the motor current measured for the second period of time; and performing a second adjustment of the voltage output of the VSD based on a change in the revolution rate and the motor current between the first period of time and the second period of time.

A method comprises operating an electric submersible pump (ESP) motor downhole in a well. The ESP motor is electrically connected to a variable speed drive (VSD) proximate to the well. The operating comprises measuring a revolution rate and a motor current of the ESP motor for a first period of time and performing a first adjustment of a voltage output of the VSD. The method comprises measuring, after the first adjustment, the revolution rate and the motor current of the ESP motor for a second period of time determining a difference between the motor current measured for the first period of time and the motor current measured for the second period of time; and performing a second adjustment of the voltage output of the VSD based on a change in the revolution rate and the motor current between the first period of time and the second period of time.

An electromechanical actuator with a through-going center passage for use under water, wherein the motor and transmission elements are arranged in parallel with and are via dog elements mechanically coupled to the axially displaceable elements through a sealing partition. A hydraulic axially displaceable piston ring facilitates secondary release of locking segments in a coupling device.

An electromechanical actuator with a through-going center passage for use under water, wherein the motor and transmission elements are arranged in parallel with and are via dog elements mechanically coupled to the axially displaceable elements through a sealing partition. A hydraulic axially displaceable piston ring facilitates secondary release of locking segments in a coupling device.