US 11,867,035 B2
Charge pump for electric submersible pump (ESP) assembly
Donn J. Brown, Tulsa, OK (US); Ketankumar Kantilal Sheth, Tulsa, OK (US); Randy Louis Mathes, Tulsa, OK (US); and Casey Laine Newport, Tulsa, OK (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Oct. 1, 2021, as Appl. No. 17/492,230.
Prior Publication US 2023/0105823 A1, Apr. 6, 2023
Int. Cl. E21B 43/12 (2006.01); E21B 43/38 (2006.01); F04D 13/10 (2006.01); F04D 1/04 (2006.01)
CPC E21B 43/128 (2013.01) [E21B 43/38 (2013.01); F04D 1/04 (2013.01); F04D 13/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electric submersible pump (ESP) assembly, comprising:
an electric motor having a first drive shaft;
a seal section coupled at a lower end to an upper end of the electric motor having a second drive shaft coupled to the first drive shaft;
a charge pump assembly disposed downstream of the seal section, wherein the charge pump assembly comprises
a third drive shaft coupled to the second drive shaft,
a first fluid mover mechanically coupled to the third drive shaft and having a fluid inlet and a fluid outlet,
a fluid reservoir concentrically disposed around the third drive shaft and located downstream of the first fluid mover, wherein an inside surface of the fluid reservoir and an outside surface of the third drive shaft define a first annulus that is fluidically coupled to the fluid outlet of the first fluid mover, and
a second fluid mover mechanically coupled to the third drive shaft and having a fluid inlet and a fluid outlet, wherein the second fluid mover is located downstream of the fluid reservoir, and wherein the fluid inlet of the second fluid mover is fluidically coupled to the first annulus wherein the charge pump assembly is configured to flow substantially all of a fluid received by the first fluid mover out an outlet disposed at a downstream end of the charge pump assembly;
a gas separator assembly coupled at an upstream end to the outlet of the charge pump assembly, having a fourth drive shaft coupled directly or indirectly to the third drive shaft and having an inlet in fluid communication with an outlet of the charge pump assembly, having a gas flow path and liquid flow path separator having a gas phase discharge port open to an exterior of the gas separator assembly and a liquid phase discharge port; and
a production pump assembly coupled at an upstream end to a downstream end of the gas separator assembly and having an inlet in fluid communication with the liquid phase discharge port of the gas flow path and liquid flow path separator.