Method for determining the position and inclination of a flame front during in situ combustion of a rubbled oil shale retort
US4167213A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1978 |
| Grant date | Sep 11, 1979 |
| Priority date | — |
| Expiry date | Jul 17, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A passive method for locating the position and inclination of a flame front, within an oil-shale retort of known dimensions and location during an in situ combustion of the retort involving detecting the sound generated by the flame front, by two matched detectors separated by a fixed known distance. The pair of matched detectors are suspended vertically in a liquid-filled well which was drilled essentially parallel to the side wall of the retort. The outputs of the two detectors are fed directly to a differential amplifier and the resulting difference signal is monitored as a function of depth as the pair of detectors are raised and/or lowered in the well. The minimum in this signal corresponds to the position of the flame front within the retort. Repeated measurements in various observation wells establish the inclination of the flame front.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.