Low clearance downhole pump
US7874367B2 · kind B2 · utility
Assignees
Inventor
Key dates
| Filing date | May 15, 2008 |
| Grant date | Jan 25, 2011 |
| Priority date | — |
| Expiry date | Dec 4, 2028 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B53/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pump has a housing having a top plate and a bottom plate and a shaft slidingly extending through an aperture in the top plate. A piston is connected to the shaft. The piston separates a volume within the housing into a first stage chamber defined in the housing below the piston and a second stage chamber defined in the housing above the piston. A fluid transfer port in the piston is in fluid communication with the second stage chamber and, through a check valve, with the first stage chamber. Another stage check valve allows one-way flow of fluid from a suction area below the bottom plate into the first stage chamber. A pressure control valve may be provided for selectively allowing fluid to flow out of the first stage chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.