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.

The invention provides an apparatus, system, and method for detecting a layer of contaminants, such as oil and/or hydrocarbons, on the surface of accumulated water within a confined area that is periodically evacuated by a pump. The detection of contaminant layers may be accomplished through the use of an optical detection system comprising a light source, and a conductive sensor comprising a horizontally-disposed plate and a stilling tube. Dissipation of turbulence and agitation of the accumulated water may be achieved by a stilling tube proximate one or more of the sensors disposed within the stilling tube. Additional sensors may detect high, intermediate, and low levels, and an integrated controller may determine the state of media within the confined area, the system being generally configured to keep the oil or other contaminant within the confined area while continuously and/or periodically pumping water away from the confined area.

An electric submersible pump (ESP) assembly comprises a centrifugal pump assembly, a seal section and an electric motor comprising a drive shaft having a bore concentric with a longitudinal axis of the drive shaft. A fluid mover disposed within and coupled to the bore of the drive shaft is configured for urging lubricating oil upward in the bore. The fluid mover includes at least one helical flighting open in the middle. The electric motor may also have a bearing coupled to the drive shaft and a bushing that is retained by a housing or by stator structure of the electric motor. The bushing defining at least one fluid flow channel extending from an upper edge of the bushing to a lower edge of the bushing and a middle portion of the fluid flow channel open to the inside surface of the bushing.

A method for mitigating water invasion to a submersible motor includes: forming an accumulation zone within an inner space of the submersible motor, wherein the accumulation zone is disposed at a bottom of the inner space below a motor shaft; measuring a conductivity of a fluid inside the accumulation zone using a sensor, wherein the fluid comprises water and dielectric oil; comparing the conductivity of the fluid with a threshold value; upon detecting that the conductivity of the fluid is greater than the threshold value, activating a solenoid pump to discharge the fluid from the accumulation zone to an outside of the submersible motor.

A submersible pump comprises a rotational assembly and a rotational assembly housing. The rotational assembly has a plurality of in-line flow inducing sections. A centerline longitudinal axis of each of the flow inducing sections extends colinearly with a rotational axis of the rotational assembly. A downstream end portion of a flow pressurizing section is engaged with an upstream end portion of a rotational flow amplification section. A downstream end portion of the rotational flow amplification section is engaged with an upstream end portion of a flow outlet section. The rotational assembly housing has an interior space extending along a centerline axis of the rotational assembly housing. The rotational assembly is disposed within the interior space of the rotational assembly housing. The rotational assembly and the rotational assembly are jointly configured for causing the rotational axis to extend colinearly with the centerline longitudinal axis of the rotational assembly housing.

A submersible well pump assembly having a motor with a shaft, a stator, a rotor coupled to the shaft, and bearing sleeves between the shaft and a bearing assembly. The rotor includes a number of rotor sections located along an axis of the shaft, where each rotor section includes a stack of rotor disks and end rings on each end of the stack. Each bearing sleeve attaches to an end ring and extends axially away from the end ring into abutment with an end of another bearing sleeve attached to an adjacent end ring.

Methods are provided to prepare a low sulfur fuel from hydrocarbon sources, such as light tight oil and high sulfur fuel oil, often less desired by conventional refiners, who split crude into a wide range of differing products and may prefer presence of wide ranges (C3 or C5 to C20 or higher) of hydrocarbons. These fuels can be produced by separating feeds into untreated and treated streams, and then recombining them. Such fuels can also be formulated by combinations of light, middle and heavy range constituents in a selected manner as claimed. Not only low in sulfur, the fuels of this invention are also low in nitrogen and essentially metals free. Fuel use applications include on-board large marine transport vessels but also on-shore for large land based combustion gas turbines, boilers, fired heaters and transport vehicles and trains.

Disclosed herein are electric submersible pump assemblies and methods for pumping wellbore fluid that may each include an electric submersible pump assembly which may include: a shroud that may include: a first shroud aperture; and a second shroud aperture; a first pump disposed in the shroud, wherein the first pump may be capable of pumping wellbore fluid that has flowed through the first shroud aperture; and a second pump disposed in the shroud, wherein the second pump may be capable of pumping out of the second aperture wellbore fluid that has flowed through the first shroud aperture.

Stationary diffusers, downhole centrifugal pumps, and methods of pressurizing a fluid may include vanes configured to direct fluid flow through fluid passageways, where at least some of the vanes include a bulge or protrusion extending axially beyond the fluid passageways into an open rotational volume of the diffuser in a direction toward an impeller.

An electric submersible pump (ESP) that has a motor section for driving the ESP. The motor section has a stator has an inner surface, winding channels disposed axially therein and windings disposed in the winding channels to generate an electromagnetic field when power is supplied to the ESP. The motor section also has a rotor rotatably disposed in the stator. The rotor has permanent magnets or induction windings disposed therein that are responsive to the electromagnetic field to facilitate rotation of the rotor relative to the stator. The motor section also includes a manipulated air gap disposed between the rotor and the stator that the electromagnetic field crosses. The manipulated air gap provides a desired constant radially directed load on the rotor to stabilize the rotor when instability of the motor section occurs. A method of designing and constructing the ESP disclosed herein. To design and construct the ESP, a desired constant radially directed load is determined for an electric submersible pump (ESP) to stabilize the ESP when instability of an electromagnetic field of the ESP occurs. The air gap is manipulated to achieve the desired constant radially directed load or the design of a stator of the ESP is manipulated to achieve the desired constant radially directed load. The ESP can then be constructed.