Compounds and method for generating a highly efficient membrane in water-based drilling fluids
US6997270B2 · kind B2 · utility
2Cited by
8References
33Claims
0Family size
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Key dates
| Filing date | Dec 30, 2000 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | May 6, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/607
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method is disclosed that affords improved stability to wellbores during drilling in argillaceous formations with water-based drilling fluids. The method comprises adding to the drilling fluid a compound of the invention having the capacity in water to generate a highly efficient membrane on argillaceous materials. The compound is soluble in the drilling fluid at least at the pH at which the compound is added to the drilling fluid or exists in the drilling fluid, but is insoluble in the water in the pores of the argillaceous formations, or at least at the pH of the water in such pores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.