Determining the locus of a processing zone in an in situ oil shale retort by sound monitoring
US4082145A · kind A · utility
24Cited by
10References
31Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 18, 1977 |
| Grant date | Apr 4, 1978 |
| Priority date | — |
| Expiry date | May 18, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21C41/24
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The locus of a processing zone advancing through a fragmented permeable mass of particles in an in situ oil shale retort in a subterranean formation containing oil shale is determined by monitoring for sound produced in the retort, preferably by monitoring for sound at at least two locations in a plane substantially normal to the direction of advancement of the processing zone. Monitoring can be effected by placing a sound transducer in a well extending through the formation adjacent the retort and/or in the fragmented mass such as in a well extending into the fragmented mass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.