Calcium ion tolerant self-suspending proppants
US9932521B2 · kind B2 · utility
13Cited by
72References
24Claims
0Family size
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Key dates
| Filing date | Feb 26, 2015 |
| Grant date | Apr 3, 2018 |
| Priority date | — |
| Expiry date | Jul 25, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/805
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A self-suspending proppant comprises a proppant particle substrate carrying a coating of an anionic hydrogel-forming polymer. The detrimental effect of calcium and other divalent ions on the ability of the proppant to swell when contacted with water is reduced by including a calcium binding agent in the proppant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.