Viscoelastic surfactant acid treatment
US8895481B2 · kind B2 · utility
4Cited by
22References
21Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 21, 2009 |
| Grant date | Nov 25, 2014 |
| Priority date | — |
| Expiry date | Dec 21, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/30
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of treating a subterranean formation penetrated by a wellbore involves introducing an acid treatment fluid through the wellbore into the formation. The treatment fluid is formed from a zwitterionic viscoelastic surfactant, an acid in an amount to provide the treatment fluid with an initial pH of ≦0 and a rheology enhancer. The treatment fluid has a high viscosity at the initial pH and a lower viscosity when the pH of the treatment fluid is raised to an intermediate pH of from greater than 0 to about 5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.