Abstract: A downhole-type tool includes a casing joint, a housing affixed to the casing joint, and an electric stator encased in the housing. The housing defines an inner bore and has an inner bore wall that is continuous with an inner wall of the casing joint. The housing is sealed against ingress of cement to the stator. The electric stator is configured to drive an electric rotor-impeller. A flow of cement can be received with an outer surface of the housing. The flow of cement can be directed into an annulus between the housing and a wall of a wellbore. The casing joint can be cemented in the wellbore.

Abstract: A rotor for an electric machine includes a central hub with a cylindrical outer surface. A plurality of elongate spacers are affixed to the central hub at its outer surface. The spacers are circumferentially spaced apart from each other and extend axially along the outer surface of the central hub. A plurality of permanent magnets reside on the outer surface between the spacers. The magnets define at least two magnetic poles of the rotor. A metallic shield surrounds an outward facing surface of the permanent magnets and spacers to shield the magnets from high frequency magnetic fields that would cause eddy currents, and thus magnet heating. The metallic shield includes a metallic foil. A carbon fiber retaining sleeve surrounds an outward facing surface of the metallic shield. The carbon fiber sleeve is configured to retain the magnets to the central hub during operation of the electric machine.

Abstract: A rotor for an electric machine has a permanent magnet carrier that defines a plurality of permanent magnet receptacles. A plurality of permanent magnets are received in the receptacles. The magnets are arranged to define at least two magnetic poles of the rotor. A metallic shield surrounds an outward facing surface of the permanent magnets to shield the magnets from high frequency magnetic fields that would cause eddy currents, and thus magnet heating. The metallic shield is constructed from a metallic foil. A carbon fiber retaining sleeve surrounds an outward facing surface of the metallic shield. The carbon fiber sleeve is configured to retain the magnets to the permanent magnet carrier during operation of the electric machine. The permanent magnet carrier is interference fit over a rotor core.

Abstract: A downhole-type device includes an electric machine. The electric machine includes an electrical rotor configured to couple with a device to drive or be driven by the electric machine. An electrical stator surrounds the electric rotor. The electric stator includes a seal configured to isolate stator windings from an outside, downhole environment. An inner surface of the seal and an outer surface of the electric rotor define an annulus exposed to the outside environment. A bearing couples the electric rotor to the electric stator. A lubrication system is fluidically coupled to the downhole-type device. The lubrication system includes a topside pressure pump and a downhole-type distribution manifold configured to be used within a wellbore. The distribution manifold is fluidically connected to the topside pressure pump and the bearing to receive a flow of lubricant from the topside pressure pump.

Abstract: An electric submersible pump (ESP) is described. The ESP includes a stator chamber, a stator within the stator chamber, a rotor, and an electrical connection. The stator chamber is configured to reside in a wellbore. The stator chamber is configured to attach to a tubing of a well. The stator chamber defines an inner bore having an inner bore wall that, when the stator chamber is attached to the tubing, is continuous with an inner wall of the tubing. The rotor is positioned within the inner bore of the stator chamber. The rotor includes an impeller. The rotor is configured to be retrievable from the well while the stator remains in the well. The stator is configured to drive the rotor to rotate the impeller and induce well fluid flow in response to receiving power through the electrical connection.

Abstract: A stator for a downhole-type motor includes a housing. The housing includes a sleeve. The sleeve includes a first layer, a second layer, and a third layer. The first layer is erosion-resistant. The second layer is corrosion-resistant. The third layer can provide structural support. The stator includes a motor stack. The stator can be used to drive a rotor disposed within an inner bore of the housing.

Abstract: A stator assembly for a downhole-type well tool includes a stator housing including an internal chamber, an electric stator, a flow channel in the stator housing, and a heat exchanger. The electrical stator is disposed within the stator housing and in contact with the heat exchanger, the electrical stator to drive a rotor. The flow channel in the stator housing includes an inlet and an outlet, and the heat exchanger includes a first heat exchanger portion in contact with the electric stator in the internal chamber and a second heat exchanger portion at least partially disposed in the flow channel. The flow channel flows coolant fluid along the second heat exchanger portion to transmit heat across the heat exchanger from the electric stator to the coolant fluid.

Abstract: A downhole-type device includes a fluid-end with a fluid rotor configured to move or be rotated by wellbore fluids. A fluid stator surrounds and supports the fluid rotor. A first bearing couples the fluid rotor to the fluid stator. A second bearing couples the fluid rotor to the fluid stator. An electric machine includes an electrical rotor rotably coupled to the fluid rotor. The electric rotor is configured to rotate in unison with the fluid rotor. An electrical stator surrounds and supports the electric rotor. A lubrication system is fluidically coupled to the downhole-type device. The lubrication system includes a topside pressure pump. A downhole-type distribution manifold is within a wellbore. The distribution manifold fluidically connects to the topside pressure pump, the first bearing, and the second bearing.

Abstract: An electric motor is configured to be positioned in a well. The motor includes a housing flooded with an incompressible fluid, a seal, a stator in the housing, and a rotor-impeller. The housing is configured to affix to a tubing of the well. The housing defines an inner bore having an inner bore wall continuous with an inner wall of the tubing for flow of well fluid. The housing defines a port that can be in fluid communication with the well. The seal seals the port against ingress of fluid. The seal is movable by the well fluid to apply a pressure on the incompressible fluid to equalize pressure between the incompressible fluid and the well fluid. The rotor-impeller is configured to be positioned within the inner bore of the housing. The rotor-impeller is configured to be retrievable from the well while the stator remains in the well.

Abstract: This disclosure describes various implementations of a downhole-blower system that can be used to boost production in a wellbore. The downhole-blower system includes a blower and an electric machine coupled to the blower that can be deployed in a wellbore, and that can, in cooperation, increase production through the wellbore.

Abstract: A first electric stator surrounds a first electric rotor and is configured to cause the first electric rotor to rotate or generate electricity in the first electric stator when the first electric rotor rotates. The first electric stator includes a first set of electric windings. A second electric stator surrounds the second electric rotor and is configured to cause the second electric rotor to rotate or generate electricity in the second electric stator when the second electric rotor rotates. The second electric stator includes a second set of electric windings. The second electric stator is electrically coupled to the first electric stator. A controller is electrically coupled to both the first electric stator and the second electric stator. The controller is configured to exchange an electric current with a combination of the first electric stator and the second electric stator.

Abstract: A downhole-type device includes a fluid-end with a fluid rotor configured to move or be rotated by wellbore fluids. A fluid stator surrounds and supports the fluid rotor. A first bearing couples the fluid rotor to the fluid stator. A second bearing couples the fluid rotor to the fluid stator. An electric machine includes an electrical rotor rotably coupled to the fluid rotor. The electric rotor is configured to rotate in unison with the fluid rotor. An electrical stator surrounds and supports the electric rotor. A lubrication system is fluidically coupled to the downhole-type device. The lubrication system includes a topside pressure pump. A downhole-type distribution manifold is within a wellbore. The distribution manifold fluidically connects to the topside pressure pump, the first bearing, and the second bearing.

Abstract: Providing power to a downhole-type tool includes positioning a downhole-type electric motor in a wellbore, electrically connecting a variable speed drive to the electric motor with three-phase conductors extending between the variable speed drive and the electric motor, where the variable speed drive controls and supplies power to the electric motor through the three-phase conductors, diverting at least a portion of a power supply from the three-phase conductors to a rectifier, and supplying, from the rectifier, the diverted portion of the power supply to at least one downhole-type tool proximate to the electric motor, the at least one downhole-type tool operable using the diverted portion of the power supply.

Abstract: An electric motor is configured to be positioned in a well. The motor includes a housing flooded with an incompressible fluid, a seal, a stator in the housing, and a rotor-impeller. The housing is configured to affix to a tubing of the well. The housing defines an inner bore having an inner bore wall continuous with an inner wall of the tubing for flow of well fluid. The housing defines a port that can be in fluid communication with the well. The seal seals the port against ingress of fluid. The seal is movable by the well fluid to apply a pressure on the incompressible fluid to equalize pressure between the incompressible fluid and the well fluid. The rotor-impeller is configured to be positioned within the inner bore of the housing. The rotor-impeller is configured to be retrievable from the well while the stator remains in the well.

Abstract: A downhole-type tool includes a casing joint, a housing affixed to the casing joint, and an electric stator encased in the housing. The housing defines an inner bore and has an inner bore wall that is continuous with an inner wall of the casing joint. The housing is sealed against ingress of cement to the stator. The electric stator is configured to drive an electric rotor-impeller. A flow of cement can be received with an outer surface of the housing. The flow of cement can be directed into an annulus between the housing and a wall of a wellbore. The casing joint can be cemented in the wellbore.

Abstract: This disclosure describes various implementations of a downhole-blower system that can be used to boost production in a wellbore. The downhole-blower system includes a blower and an electric machine coupled to the blower that can be deployed in a wellbore, and that can, in cooperation, increase production through the wellbore.

Abstract: A multi-phase, inductive coupling first portion is carried by a tubular. The coupling first portion is configured to inductively transmit current with a corresponding multi-phase, inductive coupling second portion. A downhole-type electric stator is carried by the tubular and is configured to receive and electromagnetically interact with an electric rotor-impeller. The coupling first portion is electrically connected to windings of the stator.

Abstract: A parameter of a magnetic bearing supporting a rotor in operation within a stator of the downhole-type rotating machine is measured. A speed of the rotor is controlled based on the measured parameter.

Abstract: Providing power to a downhole-type tool includes rotating a rotor of a downhole power unit about a longitudinal axis, generating, with a generator stator assembly of a generator positioned adjacent the downhole power unit, an amount of power in response to rotating the rotor, and supplying, with the generator, the amount of power to at least one downhole-type tool proximate to the downhole power unit. The at least one downhole-type tool is operable using the supplied amount of power.

Abstract: A downhole-type system includes a rotatable rotor, a magnetic thrust bearing coupled to the rotor, and a mechanical thrust bearing coupled to the rotor. The magnetic thrust bearing is configured to support a first portion of an axial load of the rotor during rotor rotation, and the mechanical thrust bearing is configured to support a second portion of the axial load of the rotor during rotor rotation.