Abstract: A well pump assembly has a main pump suspended on a string of production tubing within casing in a well. A charge pump is located below the main pump. An annular sealing element between the charge pump intake and the charge pump discharge seals between the charge pump and the casing. A motor is coupled with the main pump and the charge pump. A bypass member has an open upper end above the main pump intake and a lower end above the sealing element. The bypass member defines a flow path from the discharge of the charge pump upward past the main pump intake, then downward to reach the main pump intake. The bypass member may be a bypass riser extending alongside the main pump, or it may be a shroud surrounding the main pump.

Abstract: A lower separator located below a submersible well pump intake has a labyrinth flow path, causing a first well fluid separation of lighter components from heavier components as well fluid flowing into the lower separator turns downward to flow toward a lower separator heavier component port. A bypass riser has a bypass riser inlet below the pump intake and a bypass riser outlet above the pump intake. A lighter component conduit communicates the bypass riser inlet with lighter components of the first well fluid separation, causing a second well fluid separation at the riser outlet as a heavier portion of the lighter components flowing up the riser turn to flow downward to the pump intake. A heavier component conduit bypasses the bypass riser inlet and delivers the heavier components of the first well fluid separation to the pump intake.

Abstract: A well pump assembly has a main pump suspended on a string of production tubing within casing in a well. A charge pump is located below the main pump. An annular sealing element between the charge pump intake and the charge pump discharge seals between the charge pump and the casing. A motor is coupled with the main pump and the charge pump. A bypass member has an open upper end above the main pump intake and a lower end above the sealing element. The bypass member defines a flow path from the discharge of the charge pump upward past the main pump intake, then downward to reach the main pump intake. The bypass member may be a bypass riser extending alongside the main pump, or it may be a shroud surrounding the main pump.

Abstract: A lower separator located below a submersible well pump intake has a labyrinth flow path, causing a first well fluid separation of lighter components from heavier components as well fluid flowing into the lower separator turns downward to flow toward a lower separator heavier component port. A bypass riser has a bypass riser inlet below the pump intake and a bypass riser outlet above the pump intake. A lighter component conduit communicates the bypass riser inlet with lighter components of the first well fluid separation, causing a second well fluid separation at the riser outlet as a heavier portion of the lighter components flowing up the riser turn to flow downward to the pump intake. A heavier component conduit bypasses the bypass riser inlet and delivers the heavier components of the first well fluid separation to the pump intake.