Functionalized clay compositions for aqueous based drilling fluids
US7989402B2 · kind B2 · utility
6Cited by
10References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 14, 2006 |
| Grant date | Aug 2, 2011 |
| Priority date | — |
| Expiry date | Dec 14, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/145
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An aqueous drilling fluid which contains a diquaternary ammonium cation functionalized clay which provides a substantially constant rheological profile, with respect to salinity, when incorporated into well drilling fluids. A clay/organic chemical composition includes: (a) montmorillonite clay and (b) one or more diquaternary ammonium compounds. A further aspect of the invention is a well drilling process which employs a drilling fluid containing the diquaternary ammonium cation functionalized clay described hereafter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.