Method of secondary oil recovery using an aminoalkylene phosphonic acid and an amine neutralizing agent
US8349772B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2009 |
| Grant date | Jan 8, 2013 |
| Priority date | — |
| Expiry date | Jul 1, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/602
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of secondary oil recovery is disclosed wherein from 0.1 to 100 000 ppm of a medium soluble aminoalkylene phosphonic acid amine salt are used wherein both the aminoalkylene phosphonic acid moiety and the amine moiety are selected from a specifically defined class of compounds. The substantially medium soluble aminoalkylene amine phosphonates exhibit a significantly improved compatibility with the recovery medium and thus can propagate fairly freely into the medium and consequently cover a largely extended rock surface before being subject to precipitation in the form of a medium insoluble scale inhibitor. The amine compound is represented by combinations of structurally different compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.