An electric submersible pump (ESP) assembly that includes an electric motor with a splined drive shaft with drive shaft teeth, an ESP mechanically coupled to the electric motor that includes a splined ESP shaft with ESP shaft teeth, and a downhole component mechanically coupled to the electric motor that includes a splined component shaft with component shaft teeth. Splined couplings each include a central axis and grooves through the coupling with groove sidewalls sized to receive the shaft teeth. The grooves are angled relative to the central axis to form a space on either side of each tooth in each groove for at least a portion of the overlapped length of the tooth within the groove. Each coupling is engageable with the teeth of two of the drive shaft, the pump shaft, or the component shaft to mechanically couple the electric motor, the ESP, and the downhole component.

An electrical submersible well pump (ESP) has a motor electrical connector mounted to an exterior of the motor. A motor sensor connects to an interior side of the motor electrical connector. Seal first and second electrical connectors mount to an exterior of a seal/motor adapter. A seal internal wire within the seal section electrically connects interior sides of the seal first and second electrical connectors together. An external motor jumper wire extends alongside the motor between the motor electrical connector and the seal first electrical connector. A pump electrical connector mounts to an exterior of a pump/seal adapter and connects to a pump sensor within the pump. An external seal jumper wire connects between the seal second electrical connector and the pump electrical connector.

The invention relates to a method for determining a pumped flow (Q) from a pump by a flowmeter that comprises an internal pressure sensor configured to measure the static liquid pressure (H-in) at the inner surface of the flowmeter, and an external pressure sensor configured to measure the static liquid pressure (H-out) at the outer surface of the flowmeter. The method comprises measuring the static liquid pressure (H-in) at the inner surface, measuring the static liquid pressure (H-out) at the outer surface, determining the Static head (H-stat) of the pump based on the measured static liquid pressure (H-in), the measured static liquid pressure (H-out) and a pressure difference (H-diff) corresponding to the difference in height position between the internal pressure sensor and the external pressure sensor, and determining the pumped Flow (Q) by using the determined Static head (H-stat) of the pump from a predetermined pump specific Q-(H-stat)-relationship.

The present de-icing apparatus provides relatively small, portable, and adjustable devices for the specific purpose of de-icing a relatively small area of surface water for use by outdoor enthusiasts. The anchorable stand provides directional, surface height, and angular adjustment of the de-icing water flow to allow for establishing the preferred de-icing pattern at the water surface. De-icing means the reduction of freezing and the minimization of ice accumulation in a given surface area of the open body of water. The fixed-height vertical member of the anchorable stand provides a 360° adjustment range of output water flow. The adjustable-height vertical member of the anchorable stand provides surface height adjustment of the intake and output water flows. The vertical rotation point or points of the anchorable stand hold the water movement device and provide angular adjustment of the intake and output water flow.

A thrust balancing apparatus for a pump includes a housing, a balancing chamber, a connecting tube, a balancing disk, a bushing, a washer, and a pair of upthrust washers. The balancing chamber defines an upper cavity and a lower cavity. The connecting tube is configured to establish fluid communication between the balancing chamber and an exterior of the housing. A first portion of the balancing disk is disposed within the upper cavity. A second portion of the balancing disk passes through the lower cavity. A third portion of the balancing disk is external to the balancing chamber. The washer is disposed between the balancing disk and the bushing. The pair of upthrust washers are disposed between the balancing disk and the balancing chamber.

An electrical submersible well pump assembly has first and second permanent magnet motors. The first motor drive shaft is connected to a coupling that has internal splines for receiving an externally splined end of the second motor drive shaft. Alignment devices rotationally align magnetic poles of the first drive shaft with the magnetic poles of the second drive shaft prior to securing the housings of the first and second motors together. The alignment devices may be a coupling irregularity in the internal splines that is at a controlled orientation relative to the magnetic poles of the first shaft and a shaft irregularity in the external splines that prevents the second drive shaft from fully engaging the coupling unless the shaft irregularity is in a specified rotational position relative to the coupling irregularity.

A submersible pump and related methods are disclosed herein. The pump assembly includes a pump housing and a motor with a motor housing/cap and an output shaft connected to an impeller that is disposed in a volute. In some forms, a separate power circuit compartment is formed integral to one of the pump housing and/or volute to store power circuitry that allows a DC pump to be used and powered by AC voltage. In other forms, the power circuit compartment is formed separate from the pump assembly and fastened or connect to the pump assembly. In preferred forms, the power circuit compartment is positioned relative to the pump assembly at a point where it will be maintained at least partially within the fluid surrounding the pump to dissipate heat from the power circuit. Numerous methods are also disclosed and contemplated herein.

An electric submersible pumping system includes a motor filled with motor lubricant, a pump driven by the motor, and a fluid expansion chamber connected to the motor. The fluid expansion chamber includes a seal bag filled with a seal bag lubricant and a bellows contained within the seal bag. The bellows includes an interior in fluid communication with the motor and an exterior in fluid communication with the seal bag lubricant.

A subsea water injection pump includes components that are cooled and lubricated by the process fluid. The pump includes opposing stages of impellers in a “back-to-back” arrangement such that the axial forces of the impeller stages partially or nearly fully offset each other. In some cases, a combination of barrier fluid and process fluid is used for lubrication and cooling.

A method for providing artificial lift with an electric submersible pump system includes providing an electric submersible pump system having a motor, a pump assembly, a seal assembly, and a shaft assembly extending along a central axis from the motor to the pump assembly. The pump assembly includes two or more pump sections and a coupling with a transmission mechanism is located between the two or more pump sections. The motor rotates a motor shaft segment of the shaft assembly that is in engagement with a first pump section and starts the first pump section. One of the transmission mechanisms is moved from a disengaged position to an engaged position where the coupling conveys the rotation of the motor shaft segment to the adjacent shaft segment and starts another of the two or more pump sections.