Disclosed is a permanent magnet direct-drive slurry pump based on gas film drag reduction, which includes a permanent magnet motor, a main shaft, an impeller, and a valve block. The permanent magnet motor includes a housing, a stator core, stator windings, a rotor core, and a permanent magnet. The rotor core and the impeller share the main shaft, and an airflow channel is provided inside the main shaft. The impeller includes a front cover plate, a back cover plate, and blades. The blades are modularly manufactured, and blade gas jet holes and hemispherical pits are provided on the pressure surface. The airflow channel in the main shaft is communicated with the blade gas-jet holes. The valve block is disposed at the tail end of the main shaft so as to control gas exhaust and prevent liquid from entering the shaft. The present invention has such advantages as a small size, high efficiency, and strong wear resistance.

A thru-tubing conveyed (TTC) pump system comprising a rig-deployed assembly and a TTC removable assembly. The rig-deployed assembly includes a motor and a receiving base. The motor is configured to turn a first shaft, and an end of the first shaft includes a non-circular cross-section in a plane perpendicular to a longitudinal axis of the first shaft. The TTC removable assembly includes an engaging base and a pump, the pump configured to be turned by a second shaft. An end of the second shaft has a non-circular cross-section in a plane perpendicular to a longitudinal axis of the second shaft. The engaging base of the TTC removable assembly engages the receiving base of the rig-deployed assembly when the TTC removable assembly is delivered downhole.

A pump combination guard and methods of use thereof, having an inner housing or guard configured to cover mechanical seal assembly and the motor coupling housed between a drive motor and a fluid pump to enable foam spray nozzles to be directly inserted into the coupling guard housings for fire suppression and an outer “Air scoop” housing or guard configured to direct motor induced airflow over the mechanical seal assembly thereby enabling fire protection and cooling to extend seal life and to protect mechanical seals from pre-mature failure.

An electrical submersible pump assembly for pumping well fluid from a well has a motor and a pump. The motor having a motor shaft that drives a pump shaft of the pump. A thrust bearing unit between the motor and the pump has a thrust bearing shaft that rotates a thrust runner in sliding engagement with a non-rotating thrust bearing base. A pump shaft coupling couples the thrust bearing shaft with the pump shaft. A motor shaft coupling couples the thrust bearing shaft with the motor shaft. At least one of the couplings has a one-way clutch that allows forward direction rotation of the thrust bearing shaft and prevents reverse direction rotation.

A pump driven coolant filling device and corresponding methods are configured for adding liquid coolant to a coolant circuit for removing heat. The device and methods may be used with liquid coolant circuits on electronic components, or in other industries that utilize liquid coolant. The device includes a base having an integrated pump for circulating coolant to the cooling circuit. A disposable container of coolant may be attached to the base using a threaded connection. The device includes a handle with a switch for controlling operation of the pump in some embodiments. A coolant circuit includes quick connect couplings configured for attachment to corresponding hoses extending from the base. During use, a cooling circuit may continue operation while adding coolant to the cooling circuit using the device.

Systems and methods for preventing rotation of an ESP motor when the motor is not powered on, thereby preventing the motor from acting as a generator when fluid flowing through the pump section of the ESP applies a torque to the motor. In one embodiment, an ESP has a motor section, a pump section. The ESP may include a directional coupling that allows unidirectional rotation between the motor shaft and a pump shaft of the pump section, and a directional lock that allows unidirectional rotation between the motor shaft and a housing of the motor section. The directional coupling and directional lock allow the pump shaft to freewheel in the forward direction without causing the motor shaft to rotate, and prevent the pump shaft and motor from rotating in the reverse direction.

A pumping system includes a motor and a drive shaft configured for rotation by the motor. The pumping system includes an upper pump positioned above the motor, an upper pump shaft and an upper directional coupling connected between the drive shaft and the upper pump shaft. The upper directional coupling is configured to lock the upper pump shaft to the drive shaft when the drive shaft is rotated in a first direction. The pumping system further includes a lower pump positioned below the motor, a lower pump shaft, and a lower directional coupling connected between the drive shaft and the lower pump shaft. The lower directional coupling is configured to lock the lower pump shaft to the drive shaft when the drive shaft is rotated in a second direction.

An electrical submersible well pump assembly (ESP) has a spring brake having helical turns mounted between the shaft and one of the housings. The spring brake allows free rotation of the shaft in a driving direction and stops the shaft from rotating in a reverse direction. The spring brake may have one end be affixed to the housing to rotate in unison in both directions. Alternately, the spring brake may have one end affixed to the shaft for rotation with the shaft. Further, the spring brake could be free of being connected to either the shaft or the housing. A shear member may be mounted between the shaft and the housing to prevent any rotation of the shaft during run-in.

An electrical submersible pump assembly comprising a first section and a second section with an outer housing and a drive shaft. A coupling assembly comprising a coupling, a thrust pin, and a retainer ring mechanically couples the first drive shaft to the second drive shaft. The coupling is generally cylindrical in shape with splines formed along the inner surface configured to transfer torque from the first shaft to the second shaft. The thrust pin is installed in a pin bore in the lower shaft and extends into a retainer bore in the upper shaft. The retainer ring is installed between a groove in the retainer bore and a retainer groove on the outside of the thrust pin. The thrust pin is configured to transfer tensile stress from the retainer bore in first drive shaft to the pin bore in the second drive shaft.

A pump assembly is provided with a coupling unit that connects a pump casing to a motor casing. The coupling unit has a pump-side connection part and a motor-side connection part. An annular element is arranged between the connection parts using supports which minimize heat transfer between the pump-side connection part and the motor-side connection part.