Positive displacement pump
US7610964B2 · kind B2 · utility
24Cited by
14References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 18, 2008 |
| Grant date | Nov 3, 2009 |
| Priority date | — |
| Expiry date | Apr 30, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/13
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A submersible pumping system for use downhole that includes a housing containing an expandable fluid, that when expanded pushes a piston that in turn pumps wellbore fluid to the surface. The expandable fluid can be a silicon based heat transfer fluid with a coefficient of thermal expansion of at least about 0.0005 in3/in3/° F. The expandable fluid is expanded upon exposure to heat. A heat source is selectively activated for expanding the fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.