Heavy oil recovering
US4456065A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 1981 |
| Grant date | Jun 26, 1984 |
| Priority date | — |
| Expiry date | Aug 20, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/305
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In a section of an oil field a first and only bore hole (5) is drilled through the strata (3) carrying heavy oil until the underlying stratum (4) void of heavy oil and enlarged to a cavern-like collection chamber (9). Around this first bore hole (5) a plurality of second bore holes (6) are drilled through the strata (3) carrying heavy oil to the stratum (4) in a pattern comprising several circles. A further pattern of third bore holes (7) is drilled also in a circle-like pattern through the strata (5) carrying heavy oil, which third bore holes (7) are followed by drainage channels (8), which extend to the collecting chamber (9). By means of electrodes arranged in the second bore holes (6) the heavy oil strata are preheated and thereafter steam is injected through the same bore holes (6) in order to drive flowable heavy oil against the third bore holes (7). A solvent is injected from the third bore holes (7) into the cone-like heavy oil accumulation (18) and by means of a further injection of steam from the second bore holes (6) the heavy oil rendered flowable by the solvent is driven toward the third bore holes (7) such to flow into the collecting chamber (9) out of which it is fin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.