Method of multi-stage fracturing of subterranean formation and slurry for that method
US12227698B2 · kind B2 · utility
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13Claims
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Key dates
| Filing date | Jul 26, 2021 |
| Grant date | Feb 18, 2025 |
| Priority date | — |
| Expiry date | Jul 26, 2041 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/267
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method of hydraulic fracturing of a subterranean formation having a well bore includes steps of sequentially injecting different slurries with nano, micro and then macro sized proppants generated from coal ash into the well bore in order to enhance oil and gas production from fracking. A slurry useful in the method includes (a) water, (b) coal combustion fly ash particles that have a mean particle size (d50) of about 6 microns and (c) a surfactant.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.