An electric submersible pump assembly with integral heat exchanger, high-speed self-aligning bearings, and dual bearing thrust chamber is described. The described pump assembly, modules, and components may be used for operating an electric submersible pump at high speeds as well as over a wide range of speeds and flowrates without replacing downhole equipment. The described pump assembly may be shorter than comparable pump assemblies and may be assembled offsite, thereby leading to faster and easier installation with less down time. By operating over a wide range of speeds, the disclosed pump assembly allows the operator to reduce overall inventory, reduce down time for the well, and avoid other complications associated with replacing a pump assembly or other downhole components.

A gas venting system for an electrical submersible pump (ESP system includes a shroud and a venting system fluidically coupled to the shroud. The shroud is configured to encapsulate and fluidically seal an ESP system that includes an ESP and a motor operatively coupled to the ESP to drive the ESP. The shroud can receive well fluids including liquid components and gaseous components. The venting system can flow a portion of the gaseous components towards the surface before the gaseous components enter the ESP based on a quantity of the gaseous components received in the shroud exceeding a threshold gaseous component value.

A submersible fluid system for operating submersed in a body of water includes an electric machine and a fluid-end. The fluid-end includes a fluid-end housing having an inlet to a fluid rotor, the fluid rotor coupled to the electric machine and carried to rotate in the housing by a bearing in the housing. A fluid separator system receives a multiphase fluid and communicates a flow of the fluid to the inlet and a substantially liquid flow extracted from the multiphase fluid to the bearing.

A multistage pump for installation on a sea ground includes a common housing, a pump unit arranged in the common housing, a drive unit arranged in the common housing, and a coupling. The common housing includes a pump inlet and a pump outlet, the pump unit including a plurality of impellers to convey a compressible fluid from the pump inlet to the pump outlet, and a pump shaft, on which each impeller is mounted, each impeller being a radial or semi-axial impeller. The drive unit includes a drive shaft to drive the pump shaft, and an electric motor configured to rotate the drive shaft about an axial direction. The coupling couples the drive shaft to the pump shaft. The pump unit conveys the fluid in a dense phase at the pump outlet, and at least two impellers of the plurality of impellers have a different specific speed.

A submersible pump is provided featuring: a motor; run/start capacitors having run/start capacitor connectors; a housing having a motor housing portion and a run/start capacitor housing portion separated by a housing wall, the motor housing portion having a motor housing chamber to receive/contain the motor and oil for immersing the motor in an oil bath, the run/start housing portion having a run/start housing chamber, the housing wall having connection ports to allow sealed connections between electrical components in the motor housing portion and the run/start capacitor housing portion; a removable motor housing cover to couple/close the motor housing portion; a removable run/start capacitor housing cover to couple/close the run/start capacitor housing portion; and a capacitive cup having a side wall portion and a bottom wall portion, to be removeably arranged in the run/start capacitor housing chamber, the bottom wall portion to mount the run/start capacitors to be contained/surrounded by the side wall portion, the bottom wall portion having corresponding connection ports to allow the sealed connections between the run/start capacitor connectors and the electrical components in the motor housing portion in order to couple the run/start capacitors to the motor.

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.

A submersible well fluid system for operating submerged in a body of water may include an electric machine and a fluid end. The electric machine includes a rotor and a stator residing in a first housing at specified conditions. The fluid end may include an impeller and be coupled to the electric machine. The submersible well fluid system may also include an adjustable speed drive for the electric machine in the housing. The submersible well fluid system may also include a chemical distribution system for supplying treatment chemicals to the submersible well fluid system, a barrier fluid supply system for supplying a barrier fluid to the submersible well fluid system, and a pressure management system.

The centrifugal compressor comprises a casing and a rotor arranged in the casing and configured to rotate around a vertical rotation axis. The rotor comprises at least one impeller having an impeller suction side and an impeller delivery side. The compressor includes a gas inlet and a gas outlet, as well as a gas flow path extending from the gas inlet to the gas outlet. An inlet plenum extends from the gas inlet towards the impeller suction side. At least one suction tube having a lower suction end and an upper discharge end is arranged such that the lower suction end thereof is arranged at a bottom of the inlet plenum. The suction tube extends upwardly towards the impeller suction side.

A technique facilitates movement of fluids with reduced component loading by utilizing opposed axial forces. The system for moving fluid may be in the form of a gas compressor, liquid pump, or other device able to pump or otherwise move fluid from one location to another. According to an embodiment, the system comprises rotor sections which are combined with pumping features. The rotor sections are disposed radially between corresponding inner and outer stator sections which may be powered to cause relative rotation of inner and outer rotor sections in opposite directions. The rotors and corresponding pumping features are configured to move fluid in opposed axial directions toward an outlet section so as to balance axial forces and thus reduce component loading, e.g. thrust bearing loading.

The present invention relates to a method of operating a variable speed motor (1) drivingly connected to a multiphase pump (3) via a shaft (4). A power transmission device (20) for transmission of power to the variable speed motor (1) from a power source (2) is provided. A first controller (30) is provided between the power source (2) and the power transmission device (20) for controlling the variable speed motor (1). A speed parameter (n) representative of a motor speed (n.sub.mot) is calculated in the first controller (30). A torque reference (Tref) is received in the first controller (30). A second controller (40) is provided in communication with the first controller (30) for compensation of the effect of the power transmission device (20). The second controller (40) comprises a representation of a compensation torque (T.sub.map) as a function of a mapped torque parameter (T.sub.map) and a mapped speed parameter (n.sub.map). The second controller (40) is arranged to receive the torque reference (T.sub.ref) and the speed parameter (n) from the first controller (30). The compensation torque (T.sub.map) for the speed parameter (n) and torque reference (T.sub.ref) is calculated in the second controller (40) based on the said representation. Then, the first controller (30) is arranged to receive the compensation torque (T.sub.map) from the second controller (40) and the first controller is controlling the variable speed motor (1) based on the received compensation torque (T.sub.map), to keep the difference between the torque reference (Tref) and the shaft torque (T.sub.mot) as small as possible.