Multiple electrical connections to optimize heating for in situ pyrolysis
US9080441B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2012 |
| Grant date | Jul 14, 2015 |
| Priority date | — |
| Expiry date | Apr 1, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B36/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for heating a subsurface formation using electrical resistance heating is provided. The method includes placing a first electrically conductive proppant into a fracture within an interval of organic-rich rock. The first electrically conductive proppant has a first bulk resistivity. The method further includes placing a second electrically conductive proppant into the fracture. The second electrically conductive proppant has a second bulk resistivity that is lower than the first bulk resistivity, and is in electrical communication with the first proppant at three or more terminal locations. The method then includes passing an electric current through the second electrically conductive proppant at a selected terminal and through the first electrically conductive proppant, such that heat is generated within the fracture by electrical resistivity. The operator may monitor resistance and switch terminals for the most efficient heating. A system for electrically heating an organic-rich rock formation below an earth surface is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.