Disproportionate permeability reduction using a viscoelastic surfactant
US8895483B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2009 |
| Grant date | Nov 25, 2014 |
| Priority date | — |
| Expiry date | Dec 20, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/30
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention discloses a method of for changing the water permeability of a subterranean formation of a well, the method comprising: providing a fluid comprising a liquid carrier and a viscoelastic surfactant; introducing the fluid into the well; and contacting the fluid and the subterranean formation wherein the action of the liquid carrier and the viscoelastic surfactant is able to change the water permeability of the subterranean formation. The fluid may further comprise methanol, or a salt which can be embodied within the carrier fluid. Advantageously, no further RPM polymer is used. In a first aspect the method is used for reducing the amount of water produced, in as second aspect for improving the oil recovery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.