Colloidal dispersions (sols) for weighting agents in fluids
US11390790B2 · kind B2 · utility
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4References
25Claims
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Key dates
| Filing date | Dec 19, 2014 |
| Grant date | Jul 19, 2022 |
| Priority date | — |
| Expiry date | May 6, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/32
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A sag-resistant fluid, such as a drilling fluid, a completion fluid, or a spacer fluid, including a colloidal suspension that includes a continuous liquid phase and a solid phase suspended in the continuous liquid phase. The solid phase includes a plurality of particles, having an average diameter of the plurality of particles less than about 1000 nm. The sag-resistant fluid has a density of from about 7 to about 30 lbm/gal, and exhibits a density variation of less than about 0.5 lbm/gal over a time period of at least about 16 hours. A method including circulating the sag-resistant fluid through a well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.