Method for plugging and subsequent treatment of subterranean formations
US4495995A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1980 |
| Grant date | Jan 29, 1985 |
| Priority date | — |
| Expiry date | May 19, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/261
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Permeable portions of a subterranean formation are temporarily plugged by driving a foam formed by interacting an aqueous surfactant solution and dense fluid carbon dioxide into the permeable portions of the formation. In an embodiment of the invention the aqueous surfactant solution and the dense fluid carbon dioxide are introduced into the formation by sequential slug injections of the foam generating compositions. In another embodiment oil is displaced from an oil-bearing underground formation by plugging more permeable portions of the formation as described above, introducing a drive fluid into the formation and producing recovered oil and drive fluid from a well penetrating the formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.