PC pump inlet backwash method and apparatus
US6907925B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Mar 20, 2003 |
| Grant date | Jun 21, 2005 |
| Priority date | — |
| Expiry date | May 28, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C13/008
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A downhole moineau pump assembly includes a stator with a rotor extending through the stator. The rotor and stator sealingly engage each other at spaced intervals to form a series of annular spaces. A primary inlet is provided for fluids to enter a first of the series of annular spaces. A surface mounted top drive unit rotates the rotor. As the rotor rotates, fluids are drawn through the primary inlet and up the series of annular spaces between the rotor and the stator. A portion of the rotor is hollow with a central flow passage extending from a secondary inlet spaced from the primary inlet to the primary inlet. A portion of the fluids being pumped to surface are diverted into the secondary inlet and pumped under pressure down the central flow passage of the rotor to the primary inlet, thereby washing accumulated solids form the primary inlet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.