Manganese-assisted waterflooding processes for enhanced oil recovery in carbonate formations
US11384277B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 2021 |
| Grant date | Jul 12, 2022 |
| Priority date | — |
| Expiry date | May 12, 2041 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/20
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Method for enhancing oil recovery in a hydrocarbon-containing carbonate reservoir including: injecting a slug of an oil recovery solution into the carbonate reservoir such that the wettability of a rock surface of the hydrocarbon-containing reservoir is altered toward more water-wet; and injecting a slug of a displacing fluid into the hydrocarbon-containing carbonate reservoir formation after injecting the slug of the oil recovery solution. The oil recovery solution comprising: a manganese-bearing aqueous solution having manganese ions and one or more major ions. The aqueous saline solution having a concentration of manganese ions between 100 and 1,000 ppm TDS and a concentration of major ions that is equivalent to the concentration of major ions in seawater as it is found in nature. The one or more major ions can include: sodium ion, magnesium ion, calcium ion, chlorine ion, sulfate ion, bicarbonate ion, and combinations of the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.