A fluid moving system and apparatus for an electric submersible pump (ESP) is described. A fluid moving system includes a gas separator between an electric submersible pump and an ESP motor, the gas separator including a separation chamber including an impeller and a diffuser, the impeller including a plurality of regressively pitched main vanes interspersed between a plurality of mixer vanes, each of the plurality of main and mixer vanes extending along the hub with a positive slope and a concave top face, and a diffuser, the diffuser including blades extending along a diffuser body in a sloped direction substantially opposite the slope of the impeller main vanes, the blades having a concave top face and a regressive pitch that mirrors the pitch of the impeller main vanes, wherein the impeller vanes and diffuser blades serve to homogenize the well fluid while facilitating downstream movement.

A well fluid centrifugal pump has a shaft passage in the shaft. The shaft passage has an open upper end above the impellers and a closed lower end below the impellers. An outlet port extends laterally from the shaft passage. A gas-lock re-priming device in the shaft passage diverts a portion of well fluid in the discharge adapter bore through the shaft passage and out the outlet port. The re-priming device may be a pressure actuated valve that is biased to a closed position and opens when the pressure in the discharge adapter bore drops below a minimum. Alternately, the re-priming device may be an orifice member with an orifice passage that continuously diverts a portion of the well fluid in the discharge adapter bore out the outlet port.

Flood water removal systems including a motor, a vacuum generating device, a discharge pump, and a vacuum tank can be efficiently arranged to be transversely mounted to a vehicle. Certain flood water removal systems can include a supercharger driven by the engine to generate vacuum. The systems can include a valve to prevent collapse of a vacuum tank and maintain a predetermined vacuum pressure without varying the speed of the motor. The systems can also include a two-stage exhaust that blends exhaust from the blower with motor exhaust in a silencer to reduce noise generation for operation in residential or other noise-sensitive settings. The systems can also include a vacuum tank comprising a noise reduction baffle to further reduce noise generation.

A cooling system is provided which includes, for instance, a coolant circulation loop, one or more primary coolant pumps, and a fill and drain pump. The primary coolant pump(s) is coupled to facilitate circulating coolant through the coolant circulation loop, and the fill and drain pump facilitates selective filling of the cooling system with the coolant, or draining of the coolant from the cooling system. The fill and drain pump is integrated with the cooling system as a backup coolant pump to the primary coolant pump(s), and circulates the coolant through the coolant circulation loop responsive to an error in the primary coolant pump(s). The primary coolant pump(s) and fill and drain pumps may be different types of pumps, and the cooling system further includes a control system for automatically activating the fill and drain pump upon detection of an error in the primary coolant pump(s).

A cooling system is provided which includes, for instance, a coolant circulation loop, one or more primary coolant pumps, and a fill and drain pump. The primary coolant pump(s) is coupled to facilitate circulating coolant through the coolant circulation loop, and the fill and drain pump facilitates selective filling of the cooling system with the coolant, or draining of the coolant from the cooling system. The fill and drain pump is integrated with the cooling system as a backup coolant pump to the primary coolant pump(s), and circulates the coolant through the coolant circulation loop responsive to an error in the primary coolant pump(s). The primary coolant pump(s) and fill and drain pumps may be different types of pumps, and the cooling system further includes a control system for automatically activating the fill and drain pump upon detection of an error in the primary coolant pump(s).

A self-priming pump assembly comprises a series connection of a liquid ring pump functioning as a rotating displacement pump and a normally-priming centrifugal pump. The self-priming pump assembly improves the fluid mechanics conditions for the flow of fluids toward and into a return line through the inclusion of a first connection opening in the meridian plane of the centrifugal pump that possesses a bulge enclosing a sector of the longitudinal axis of the first connection opening, where the bulge is one-sided and oriented toward a rotary axis of the pump assembly, and the bulge continuously expands, directly or indirectly, the first connection opening toward the impeller plane. At its end section facing the impeller plane, a transitional surface of the bulge continuously transitions into the lateral boundary surface, or an inner peripheral wall of the ring channel adjoining the lateral boundary surface.

A centrifugal pump assembly (2) includes an impeller, an electric drive motor (4), driving the impeller (12), and a back-flow channel (24), forming a flow connection from a delivery side (18) to a suction side (16). A valve (26), in a pressure-dependent manner, closes the flow connection. A control device (28) adjusts/sets the speed (n) of the drive motor (4), and is configured with a venting function for venting the centrifugal pump assembly (2) on operation. According to the venting function, after the detection of an air accumulation, the speed (n) of the drive motor (4) is automatically reduced, and subsequently the speed (n) is rapidly increased again. A method is also provided for removing an air accumulation from a centrifugal pump assembly during operation, which method includes reducing the speed (n) of the centrifugal pump assembly and subsequently rapidly increasing the speed (n) of the centrifugal pump again.

Various downhole tools are discussed, including intake and gas separators for a downhole rotary pump. Multiple intakes configured in parallel and series are discussed, along with compact axial length gas separators, and gas separators that remove gas in novel ways. Related apparatuses and methods are discussed.

A centrifugal pump includes a pump housing having a suspension inlet and a suspension outlet and a flow channel between the inlet and the outlet, a shaft mounted by bearings for rotation about a center axis, an impeller which is rotatable by the shaft, in alignment with the inlet and arranged to be rotated about the axis in the flow channel, and gas collecting openings for gas removal arranged in the flow channel. The inlet end of the flow channel includes a number of static vanes comprising gas collecting openings, the vanes extend radially from an inner wall of the flow channel toward the center of the flow channel and are upstream of the impeller.

An apparatus, system and method for flow rate harmonization in electric submersible pump (ESP) gas separators. A method for flow rate harmonization in ESP gas separators includes modifying flow of multi-phase well fluid through vent passages of a crossover when a flow rate of a centrifugal pump differs from a flow rate of a gas separator including the crossover, the gas separator serving as the fluid intake into the centrifugal pump. Flow of fluid through vent passages is modified by one of attaching flow sizing inserts into vent passages or production passages of the crossover, or by attaching a funnel to a crossover inlet. A gas separator system includes a series of interchangeable funnels attachable to a fluid entrance of a crossover of the gas separator, wherein interchanging the particular funnel attached to the crossover modifies flow rate output of the gas separator.