Process employing CO.sub.2 /CH gas mixtures for secondary exploitation of oil reservoirs
US4628999A · kind A · utility
11Cited by
11References
7Claims
0Family size
Inventors
Key dates
| Filing date | Jan 18, 1985 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | Jan 18, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/30
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
From 5 to 35%, preferably 10 to 30%, by volume of hydrocarbon gases may be incorporated as a diluent into carbon dioxide-containing gas injected during secondary exploitation of oil reservoirs. The reservoir pressure is maintained at 100 to 120 atm., respectively, up to 250 atm. The preferred range is 120 to 200 atm. The hydrocarbon gases may be added to the carbon dioxide-containing gas prior to injection and/or use may be made of ambient hydrocarbon gases present in the reservoir. The optimum gas injection rate is 40-80 m.sup.3 /day/m of formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.