Lubricating method for silicate drilling fluids
US6642183B1 · kind B1 · utility
9Cited by
11References
8Claims
0Family size
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Key dates
| Filing date | Jun 4, 2001 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Jun 4, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/22
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Improved silicate drilling fluids are produced by the addition of tetra alkyl ammonium compounds, in particular tetra methyl ammonium hydroxide to silicate drilling fluid mud to lower the co-efficient of friction between drill string and wellbore. It has also been discovered that the same tetra alkyl ammonium lubricant compounds greatly lessen the viscosity breakdown of swelled hectorite clay in the presence of silicate. This allows the preparation of silicate drilling fluids not only with enhanced lubricity but having stable rheology at the higher temperature and pressures encountered in some drilling operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.