Method of recovering viscous petroleum from tar sand
US3994340A · kind A · utility
278Cited by
9References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1975 |
| Grant date | Nov 30, 1976 |
| Priority date | — |
| Expiry date | Oct 30, 1995 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/305
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Recovery of viscous petroleum such as from tar sands is assisted using a substantially vertical passage from the earth's surface which penetrates the tar sand and has extending therefrom a lateral hole containing a flow path isolated from the tar sand for circulating a hot fluid to and from the vertical passage to develop a potential flow path into which a drive fluid is injected to promote movement of the petroleum to a production position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.