Viscoelastic surfactant fluids stable at high brine concentration and methods of using same
US7148185B2 · kind B2 · utility
30Cited by
3References
7Claims
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Key dates
| Filing date | May 9, 2003 |
| Grant date | Dec 12, 2006 |
| Priority date | — |
| Expiry date | Feb 1, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/30
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A viscous aqueous high density well treatment fluid composition stable at high temperature containing a surfactant and inorganic salts is described. Methods of preparing the fluid and increasing the stability and viscosity of the fluid are given. The fluid is useful for wellbore cleanout, hydraulic fracturing, gravel packing, completion, acid diversion, lost circulation reduction, well killing, cementing, selective water shutoff, and fracture fluid diversion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.