Additive for viscoelastic fluid
US7320952B2 · kind B2 · utility
15Cited by
12References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 2005 |
| Grant date | Jan 22, 2008 |
| Priority date | — |
| Expiry date | Sep 4, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/30
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Composition and method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a co-gelling agent selected from triblock oligomeric compounds having hydrophilic (for example polyether) and hydrophobic (for example alkyl) portions. The co-gelling agent also increases fluid viscosity and very low co-gelling agent concentration is needed. Preferred surfactants are betaines and quaternary amines. The fluids are useful in oilfield treatments, for example fracturing and gravel packing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.