Thermal mineral extraction system
US5285846A · kind A · utility
294Cited by
12References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Nov 4, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B36/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Material is thermally extracted from an underground formation with the aid of heat supplied by electrical resistance heaters (21) or by tubing (5, 6) serving as such, or by heated fluid conveyed downhole in pipes (12), which may serve as electrical conductors, or as resistance heaters, or which may be heated downhole. The fluid may be circulated upwardly after passage through a downhole pump unit where the fluid is suitable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.