Water-based drilling fluids for reduction of water adsorption and hydration of argillaceous rocks
US5635458A · kind A · utility
122Cited by
11References
18Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 1, 1995 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Mar 1, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/12
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a water-based drilling fluid that reduces water adsorption and hydration of argillaceous rocks. The drilling fluid comprises a glycol with a molecular weight of less than about 200, an organic cationic material such as salts of choline or an organic salt of potassium, a filtration control agent, a viscosifier and water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.