A method of remanufacturing a fluid end block having a plurality of segments adapted to receive working fluid includes removing at least one damaged segment from the plurality of segments of the fluid end block. The method also includes providing at least one replacement segment at a location of the at least one damaged segment. The method further includes providing a seal between a first surface of the at least one replacement segment and a first surface of at least one adjacent segment of the plurality of segments. The method includes coupling the at least one replacement segment with the at least one adjacent segment to form a remanufactured fluid end block.

Disclosed is a power unit of a hydraulic pumping unit, which comprises a motor; a pumping rod driving device for driving reciprocating movement of a pumping rod; a variable pump driven by the motor, the variable pump hydraulically connected to the pumping rod driving device; a secondary hydraulic control unit hydraulically connected to the pumping rod driving device; an energy accumulator being in transmission connection with the secondary hydraulic control unit; a sensor for setting a stroke of the pumping rod; a first control device adapted to, based on the signals from the sensor, set the discharge capacity of the variable pump to be zero during the declining process of the pumping rod and to be positive during the ascending process of the pumping rod to drive the pumping rod driving device; and a second control device adapted to based on the signals from the sensor, set the secondary hydraulic control unit to function as a motor for driving the energy accumulator to accumulate energy during the descending process of the pumping rod, and to be driven by the energy accumulator to function as a pump for driving the pumping rod driving device during the ascending process of the pumping rod. The present invention further discloses a corresponding hydraulic pumping unit. The hydraulic pumping unit has high energy recycling utilization efficiency and is simple and reliable.

Disclosed is a power unit of a hydraulic pumping unit, which comprises a motor; a pumping rod driving device for driving reciprocating movement of a pumping rod; a variable pump driven by the motor, the variable pump hydraulically connected to the pumping rod driving device; a secondary hydraulic control unit hydraulically connected to the pumping rod driving device; an energy accumulator being in transmission connection with the secondary hydraulic control unit; a sensor for setting a stroke of the pumping rod; a first control device adapted to, based on the signals from the sensor, set the discharge capacity of the variable pump to be zero during the declining process of the pumping rod and to be positive during the ascending process of the pumping rod to drive the pumping rod driving device; and a second control device adapted to based on the signals from the sensor, set the secondary hydraulic control unit to function as a motor for driving the energy accumulator to accumulate energy during the descending process of the pumping rod, and to be driven by the energy accumulator to function as a pump for driving the pumping rod driving device during the ascending process of the pumping rod. The present invention further discloses a corresponding hydraulic pumping unit. The hydraulic pumping unit has high energy recycling utilization efficiency and is simple and reliable.

A tool includes a device including a housing and a rotor, the rotor to rotate about a longitudinal axis, and an axial gap generator including a stator assembly positioned adjacent to the rotor. The axial gap generator generates a voltage signal as a function of a gap spacing between the stator assembly and the rotor, the gap spacing being parallel to the longitudinal axis.

A downhole-type system includes a rotatable shaft, a downhole-type magnetic bearing coupled to the rotatable shaft, a downhole-type sensor, a surface-type controller, and a surface-type amplifier coupled to the magnetic bearing. The magnetic bearing can control levitation of the rotatable shaft. The downhole-type sensor can detect a position of the rotatable shaft in a downhole location and generate a first signal based on the detected position. The surface-type controller can receive the first signal, determine an amount of force to apply to the shaft, and generate a second signal corresponding to the determined amount of force. The surface-type amplifier can receive the second signal, amplify the second signal to a sufficient level to drive the magnetic bearing to apply force to the rotatable shaft to control the levitation of the rotatable shaft at the downhole location, and transmit the amplified second signal to the magnetic bearing.

A fluid rotor is configured to move or be rotated by a working fluid. A fluid stator surrounds the fluid rotor. The fluid stator is spaced from the fluid rotor and defines a first annular fluid gap in-between that is in fluid communication with an outside environment exterior the downhole-type pump. A radial magnetic bearing includes a first portion coupled to the fluid rotor and a second portion coupled to the fluid stator. The first portion is spaced from the second portion defining a second annular fluid gap in-between that is in fluid communication with the outside environment exterior the downhole-type pump.

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.

A fluid module includes a fluid rotor configured to rotatably drive or be driven by fluid produced from a wellbore. A first shaft is coupled to the fluid rotor. The first shaft is configured to rotate in unison with the fluid rotor. A thrust bearing module includes a thrust bearing rotor. A second shaft is coupled to the thrust bearing rotor. The second shaft is configured to rotate in unison with the thrust bearing rotor. The second shaft is coupled to the first shaft. An electric machine module includes an electric machine rotor. A third shaft is coupled to the electric machine rotor. A third shaft is configured to rotate in unison with the electric machine rotor. The third shaft is coupled to the second shaft. The third shaft is rotodynamically isolated from the first shaft and the second shaft.

A fluid module includes a fluid rotor configured to rotatably drive or be driven by fluid produced from a wellbore. A first shaft is coupled to the fluid rotor. The first shaft is configured to rotate in unison with the fluid rotor. A thrust bearing module includes a thrust bearing rotor. A second shaft is coupled to the thrust bearing rotor. The second shaft is configured to rotate in unison with the thrust bearing rotor. The second shaft is coupled to the first shaft. An electric machine module includes an electric machine rotor. A third shaft is coupled to the electric machine rotor. A third shaft is configured to rotate in unison with the electric machine rotor. The third shaft is coupled to the second shaft. The third shaft is rotodynamically isolated from the first shaft and the second shaft.

A device includes a rotor to rotate about a longitudinal axis, a magnetic bearing actuator, and an axial gap generator including a stator assembly adjacent to the rotor, the axial gap generator to generate an amount of power as a function of a gap spacing between the stator assembly and the rotor, the gap spacing parallel to the longitudinal axis, and the axial gap generator to supply the amount of power to a control coil of the magnetic bearing actuator.