Deactivation and activation of permeability modifiers for use in subterranean formation operations
US9840659B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 2015 |
| Grant date | Dec 12, 2017 |
| Priority date | — |
| Expiry date | Feb 2, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/162
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Methods including deactivation and activation of permeability modifiers for use in subterranean formation operations. A first treatment fluid may be introduced into a subterranean formation having a first treatment zone having a first aqueous permeability value, the first treatment fluid comprising a first aqueous base fluid and a deactivated permeability modifier. The deactivated permeability modifier may be adsorbed onto a surface of the first treatment zone. A second treatment may thereafter be introduced into the subterranean formation, the second treatment fluid comprising a second aqueous base fluid and a cyclodextrin compound. The second treatment fluid may contact the deactivated permeability modifier to activate the permeability modifier by complexing the deactivating surfactant with the cyclodextrin compound, thereby forming an activated permeability modifier adsorbed onto the surface of the first treatment zone and reducing the aqueous permeability of the first treatment zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.