SUBMERSIBLE PUMP

摘要

A submersible pump includes a fluid-end section, a power-end section, a top connection sub and an umbilical. The fluid-end section includes a tubular fluid-end barrel, an upper piston disposed within the fluid-end barrel bore, and a traveling valve disposed at the upper piston upper end. The power-end section includes a tubular hydraulic cylinder. A lower piston disposed within the hydraulic cylinder bore is connected to the upper piston. The top connection sub connected to the fluid-end barrel upper end has a discharge port and a standing valve disposed below the discharge port. The umbilical includes first and second tubing strings providing fluid communications between a prime mover and the hydraulic cylinder bore below and above the lower piston face, respectively. A third tubing string provides fluid communications between a wellhead and the top connection sub discharge port.

主权项

1. A submersible pump adapted for use with a downhole well having a wellhead, a prime mover providing wellbore fluid, and a wellbore extending from the wellhead, the pump comprising:
an umbilical including
a first tubing string adapted to provide fluid communications with the prime mover,a second tubing string adapted to provide fluid communications with the prime mover, anda third tubing string adapted to provide fluid communications with the wellhead; an upper, fluid-end section including
a tubular fluid-end barrel extending from an upper end to a lower end and having an inner surface that defines an axially extending bore, andan upper piston disposed within the fluid-end barrel bore and axially, slidably movable therein, the upper piston extending from an upper end to a lower end and having
an inner surface defining a bore extending axially from the upper end,a ported piston rod adaptor disposed at the lower end defining a fluid passage for flow of wellbore fluid into the upper piston bore, anda traveling valve disposed at the upper piston upper end, the traveling valve having open and closed positions wherein the upper piston bore is in fluid communication with a space above the upper piston when the traveling valve is in the open position and no fluid can flow between the upper piston bore and the space above the upper piston when the traveling valve is in the closed position; a lower, power-end section including
a tubular hydraulic cylinder extending from an upper end to a lower end and having an inner surface defining an axially extending bore, anda lower piston disposed within the hydraulic cylinder bore and axially, slidably movable therein, the lower piston having
an upper piston face,a connecting rod extending upwardly from the upper piston face to an upper end connected to upper piston lower end, anda lower piston face; a top connection sub connected to the fluid-end barrel upper end having
a discharge port connectable with the third tubing string, anda standing valve disposed below the discharge port, the standing valve having open and closed positions wherein the space above the upper piston is in fluid communication with the discharge port when the standing valve is in the open position and no fluid can flow between the space above the upper piston and the discharge port when the standing valve is in the closed position; a bottom connection sub connected to the hydraulic cylinder lower end, the bottom connection sub having a port connectable to first tubing string providing fluid communication with the hydraulic cylinder bore below the lower piston face; an intermediate connection sub having
a lower end connected to the hydraulic cylinder upper end,a port connectable to second tubing string providing fluid communication with the hydraulic cylinder bore above the upper piston face, andan inner surface defining an axially extending bore; and a ported suction strainer having
a lower end connected to the intermediate connection sub,an upper end connected to the fluid-end barrel lower end, andan inner surface defining an axially extending bore.