Well drilling fluids and process for drilling wells
US4812244A · kind A · utility
11Cited by
7References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Sep 24, 2007 |
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 amounts of sulfonated styrene-maleimide copolymers and at least one water-soluble polymer prepared from acrylic acid or acrylate or their derivatives.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.