Recovering viscous petroleum from thick tar sand
US3994341A · kind A · utility
264Cited by
9References
11Claims
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 primaryE21B43/24
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Recovery of viscous petroleum such as from thick tar sands is assisted using a closed-loop flow path from the earth's surface through a substantial portion of the formation for conducting hot fluid to reduce the viscosity of the petroleum in the formation to develop a potential passage in the formation outside the 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.