High molecular weight polyamine salts as clay stabilizing agents
US7838468B2 · kind B2 · utility
0Cited by
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10Claims
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Key dates
| Filing date | Jan 4, 2008 |
| Grant date | Nov 23, 2010 |
| Priority date | — |
| Expiry date | Oct 2, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A clayish subterranean formation, such as may be encountered in rock surrounding a well bore during hydrocarbon recovery operations may be stabilized with relatively high molecular weight acid ammonium salts of an imide of polymaleic anhydride. The salts may be unneutralized or partially neutralized. The invention is particularly relevant to hydraulic fracturing fluids used in enhanced oil recovery. The compositions herein are made in the presence of a reactive solvent, such as a polyalkylene glycol, e.g. polyethylene glycol. The compositions of this invention are more environmentally friendly than some current technology.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.