Compositions and methods for enhanced oil recovery from low permeability formations
US11549053B2 · kind B2 · utility
0Cited by
29References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2019 |
| Grant date | Jan 10, 2023 |
| Priority date | — |
| Expiry date | Jul 29, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/20
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides compositions and methods for enhancing oil recovery from low permeability subterranean formation using three mechanisms: repressurization; reduction of interfacial tension; and increased permeability. The subject compositions comprise a chelating agent, a biosurfactant, a carbonate or bicarbonate salt, water, and a pH adjusting substance, which when applied to an oil-bearing formation according to the methods of the subject invention, allow for controlled release of carbon dioxide within the formation without complicated machinery or gas-producing microorganisms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.