Rheology enhancers
US7378378B2 · kind B2 · utility
7Cited by
90References
28Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2006 |
| Grant date | May 27, 2008 |
| Priority date | — |
| Expiry date | Apr 13, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/922
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for increasing the rate of shear rehealing of fluids made with cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer package containing, for example a polyethylene glycol-polypropylene glycol block copolymer and a polynaphthalene sulfonate. The rheology enhancer package allows viscoelastic surfactant fluids to be used at lower viscoelastic surfactant concentrations in certain applications, for example certain oilfield treatments, for example fracturing and gravel packing. Preferred surfactants are betaines and quaternary amines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.