In situ retorting of oil shale with air, steam, and recycle gas
US4454915A · kind A · utility
34Cited by
11References
9Claims
0Family size
Assignees
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Key dates
| Filing date | Jun 23, 1982 |
| Grant date | Jun 19, 1984 |
| Priority date | — |
| Expiry date | Jun 23, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/40
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A flame front is ignited and passed through an underground oil shale retort to produce shale oil. The flame front is supported by a specially blended feed gas consisting essentially of air, steam and retort off gases. Product yield and quality are increased by varying the volumetric ratio of air, steam and retort off gases in the feed gas during retorting in proportion to the oil yield, or the relative richness, leanness and kerogen content of the oil shale being heated by the flame front, or in proportion to the amount of carbon residue on the retorted shale being combusted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.