Nonionic surfactants employed with extended chain as the oil displacement agent to use in enhanced oil recovery
US11649395B2 · kind B2 · utility
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Key dates
| Filing date | Jun 17, 2020 |
| Grant date | May 16, 2023 |
| Priority date | — |
| Expiry date | Jun 17, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/20
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Some reservoirs have tight oil formations, such as the Changqing reservoir. The surfactant polymer flooding and low tension gas flooding are two potential chemical flooding methods for use in tight oil formations. In these methods, an oil displacement agent, or surfactant, is added. Nonionic surfactants with extended chains (by propylene oxide and ethylene oxide) from dialkyl alcohols or dialkyl amines were tested. A synergistic blend of surfactants was developed between the nonionic surfactants and anionic surfactants that lowers interfacial tension and improves surfactant solubility in water and oil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.