A downhole-type device includes an electric machine. The electric machine includes an electrical rotor configured to couple with a device to drive or be driven by the electric machine. An electrical stator surrounds the electric rotor. The electric stator includes a seal configured to isolate stator windings from an outside, downhole environment. An inner surface of the seal and an outer surface of the electric rotor define an annulus exposed to the outside environment. A bearing couples the electric rotor to the electric stator. A lubrication system is fluidically coupled to the downhole-type device. The lubrication system includes a topside pressure pump and a downhole-type distribution manifold configured to be used within a wellbore. The distribution manifold is fluidically connected to the topside pressure pump and the bearing to receive a flow of lubricant from the topside pressure pump.

An artificial lift assembly and method relating thereto is designed to prevent inadvertent electrical discharge caused by fluids flowing through an electrical submersible pumping system, which is part of the assembly. The assembly uses a rupture disc to prevent fluid flow during introduction of the assembly into a wellbore and a dart and sleeve to prevent fluid flow during removal of the assembly from the wellbore.

An artificial lift assembly and method relating thereto is designed to prevent inadvertent electrical discharge caused by fluids flowing through an electrical submersible pumping system, which is part of the assembly. The assembly uses a rupture disc to prevent fluid flow during introduction of the assembly into a wellbore and a dart and sleeve to prevent fluid flow during removal of the assembly from the wellbore.

Downhole pumps may include, at the inlet, a component that reduces the amount of water taken up by the pump. For example, a downhole assembly may include a tool string that includes a fluid pump, a fluid intake subassembly, a motor, and a downhole control system each coupled such that a fluid flowing into the fluid intake assembly is conveyed to the fluid pump; one or more inlets defined in the fluid intake subassembly; a flow line fluidly coupled to at least one of the one or more inlets and containing a filter component that contains a filter media at least partially coated with a relative permeability modifier (RPM), wherein the fluid flowing through the flow line contacts the RPM.

A fluid level sensor system is disclosed for sensing a fluid level in a well. The system has a main body and an inlet housing coupled to the main body. The inlet housing has an internal chamber in communication with an ambient environment within the well. A bellows within the main body communicates with the internal chamber of the inlet housing. A movable element is responsive to movement of the bellows. A sensor detects when the movable element moves from a first position, indicating a first fluid level in the well, to a second position indicating a second fluid level within the well. An indicator is operably associated with the movable element and moves into a position to be viewable when the sensing element is moved to the second position, to provide a visual indication that the second fluid level has been reached.

Systems and methods for determining proper phase rotation in a linear motor that may be used in an ESP system, where the phase rotations associated with power and return strokes are initially unknown. The method includes providing power to the motor for multiple cycles and monitoring the load (e.g., by monitoring current drawn by the motor) on the motor to determine in which direction (phase rotation) the load on the motor increases. This direction corresponds to the power stroke of the motor. The direction of increasing load is then associated with the power stroke and the motor is operated normally.

Systems and methods for determining proper phase rotation in a linear motor that may be used in an ESP system, where the phase rotations associated with power and return strokes are initially unknown. The method includes providing power to the motor for multiple cycles and monitoring the load (e.g., by monitoring current drawn by the motor) on the motor to determine in which direction (phase rotation) the load on the motor increases. This direction corresponds to the power stroke of the motor. The direction of increasing load is then associated with the power stroke and the motor is operated normally.

A multi-pump integrated mixed fluid delivery device includes a hollow cylindrical casing, a hydraulic drive part, a power part, a sample part and a pipeline unit. The hydraulic drive part, the power part, the sample part and the pipeline unit are provided within the casing in sequence. The hydraulic drive part includes multiple hydraulic plunger pumps. The power part includes a dual-shaft motor, wherein an output shaft of the dual-shaft motor is connected with the hydraulic plunger pumps. The sample part includes a lead screw, a screw nut, a piston rod and a sample chamber, wherein one end of the lead screw is connected with another output shaft of the dual-shaft motor, the screw nut is sleeved on the lead screw, the piston rod is fixedly connected with the screw nut. The sample chamber is configured to accommodate a sample.

A multi-pump integrated mixed fluid delivery device includes a hollow cylindrical casing, a hydraulic drive part, a power part, a sample part and a pipeline unit. The hydraulic drive part, the power part, the sample part and the pipeline unit are provided within the casing in sequence. The hydraulic drive part includes multiple hydraulic plunger pumps. The power part includes a dual-shaft motor, wherein an output shaft of the dual-shaft motor is connected with the hydraulic plunger pumps. The sample part includes a lead screw, a screw nut, a piston rod and a sample chamber, wherein one end of the lead screw is connected with another output shaft of the dual-shaft motor, the screw nut is sleeved on the lead screw, the piston rod is fixedly connected with the screw nut. The sample chamber is configured to accommodate a sample.

An oil field pump is installed within a pipe that connects to an oil field, and feeds accumulated extraction oil in a predetermined direction, the oil filed pump including a rotor with an internal flow path for the extraction oil, a stator installed on the outer circumference of the rotor, a thrust bearing that supports the axial weight of the rotor and the stator, a supply pipe that supplies a portion of the extraction oil in the flow path to the thrust bearing, and a filter that is installed at further upstream on the flow path than the supply pipe along the flow direction of the extraction oil, and traps foreign matter.