Well drilling fluids and process for drilling wells
US4728445A · kind A · utility
10Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1985 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | Dec 13, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The rheological characteristics of aqueous well drilling fluids are improved by incorporating into the fluids small amount of sulfonated styrene-itaconic acid copolymers and at least one water-soluble polymer prepared from acrylic acid or acrylamide or their derivatives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.