Anionic copolymers for improved control of drilling fluid rheology
US4680128A · kind A · utility
15Cited by
7References
3Claims
0Family size
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Key dates
| Filing date | Apr 26, 1985 |
| Grant date | Jul 14, 1987 |
| Priority date | — |
| Expiry date | Apr 26, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Low molecular weight copolymers of acrylic acid and salts of vinylsulfonic acid are superior dispersants and high temperature deflocculants for the stabilization of the rheological properties of aqueous claybased drilling fluids subjected to high levels of calcium ion contamination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.