Recovery of hydrocarbons from coal
US3999607A · kind A · utility
377Cited by
11References
33Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1976 |
| Grant date | Dec 28, 1976 |
| Priority date | — |
| Expiry date | Jan 22, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S48/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Coal liquids and gases are recovered from a thick underground coal seam by drilling one or more boreholes from the earth's surface into the lower part of the seam, burning out the coal over a limited area near the bottom of the seam, collapsing the overlying coal to form a rubblized zone extending vertically to a point near the upper boundary of the seam, driving a flame front vertically through the rubblized zone to liberate hydrocarbon liquids and produce gases, and recovering the liquids and gases from the rubblized zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.