Higher work output centrifugal pump stage

A method of lifting fluid in a wellbore, comprising:

• running an electrical submersible pump (ESP) assembly into a wellbore, wherein the ESP assembly comprises
• an electric motor having a first drive shaft,
• a seal unit having a second drive shaft coupled to the first drive shaft, and
• a centrifugal pump assembly having a central axis aligned parallel with a y-axis of a set of x, y, z orientation axes and comprising
• a housing,
• a third drive shaft disposed within the housing coupled directly or indirectly to the second drive shaft, and
• a plurality of pump stages, wherein each pump stage comprises a diffuser retained by the housing and an impeller mechanically coupled to the third drive shaft,
• wherein the impeller comprises an impeller hub, an impeller shroud, and a plurality of impeller vanes, wherein each impeller vane has an impeller vane first edge and an impeller vane second edge opposite the impeller vane first edge, the impeller vane first edge attaches to the impeller hub, and the impeller vane second edge attaches to the impeller shroud, wherein each impeller vane has an impeller vane trailing edge that attaches to the impeller shroud at an impeller vane trailing edge shroud attachment point and attaches to the impeller hub at an impeller vane trailing edge hub attachment point, wherein the impeller vane trailing edge shroud attachment point is disposed axially in a positive direction along the y-axis from the impeller vane trailing edge hub attachment point, and
• wherein the diffuser comprises a diffuser hub, a diffuser shroud, and a plurality of diffuser vanes, wherein each diffuser vane has a diffuser vane first edge and a diffuser vane second edge opposite the diffuser vane first edge, the diffuser vane first edge attaches to the diffuser hub, and the diffuser vane second edge attaches to the diffuser shroud, wherein each diffuser vane has a diffuser vane leading edge that attaches to the diffuser shroud at a diffuser vane leading edge shroud attachment point and attaches to the diffuser hub at a diffuser vane leading edge hub attachment point, wherein the diffuser vane leading edge shroud attachment point is disposed axially in the positive direction along the y-axis from the diffuser vane leading edge hub attachment point;
• providing electrical power to the electric motor;
• turning the centrifugal pump assembly by the electric motor;
• and
• lifting fluid by the centrifugal pump up a production tubing fluidly coupled to a discharge of the centrifugal pump.

A horizontal pump system (HPS), comprising:

• an electric motor having a first drive shaft;
• a centrifugal pump assembly having a central axis aligned parallel with a y-axis of a set of x, y, z orientation axes and comprising
• a housing,
• a second drive shaft disposed within the housing coupled directly or indirectly to the first drive shaft, and
• a plurality of pump stages, wherein each pump stage comprises a diffuser retained by the housing and an impeller mechanically coupled to the second drive shaft,
• wherein the impeller comprises an impeller hub, an impeller shroud, and a plurality of impeller vanes, wherein each impeller vane has an impeller vane first edge and an impeller vane second edge opposite the impeller vane first edge, the impeller vane first edge attaches to the impeller hub, and the impeller vane second edge attaches to the impeller shroud, wherein each impeller vane has an impeller vane trailing edge that attaches to the impeller shroud at an impeller vane trailing edge shroud attachment point and attaches to the impeller hub at an impeller vane trailing edge hub attachment point, wherein the impeller vane trailing edge shroud attachment point is disposed axially in a positive direction along the y-axis from the impeller vane trailing edge hub attachment point, and
• wherein the diffuser comprises a diffuser hub, a diffuser shroud, and a plurality of diffuser vanes, wherein each diffuser vane has a diffuser vane first edge and a diffuser vane second edge opposite the diffuser vane first edge, the diffuser vane first edge attaches to the diffuser hub, and the diffuser vane second edge attaches to the diffuser shroud, wherein each diffuser vane has a diffuser vane leading edge that attaches to the diffuser shroud at a diffuser vane leading edge shroud attachment point and attaches to the diffuser hub at a diffuser vane leading edge hub attachment point, wherein the diffuser vane leading edge shroud attachment point is disposed axially in the positive direction along the y-axis from the diffuser vane leading edge hub attachment point.