Determining the locus of a processing zone in a retort through channels
US4151877A · kind A · utility
111Cited by
11References
42Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 13, 1977 |
| Grant date | May 1, 1979 |
| Priority date | — |
| Expiry date | May 13, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/16
- 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 withdrawing a sample of gas passing through the retort through a channel through unfragmented formation and in fluid communication with the retort, and analyzing the composition of withdrawn gas. The channel can be artificially formed such as by hydraulic fracturing of unfragmented formation, or can be a naturally occurring permeable layer such as a tuff bed in the formation containing oil shale.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.