Polyampholytes - high temperature viscosifiers for high ionic strength drilling fluids
US4637882A · kind A · utility
7Cited by
6References
8Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 16, 1983 |
| Grant date | Jan 20, 1987 |
| Priority date | — |
| Expiry date | Dec 16, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F226/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A new family of terpolymers based on V-vinyl-2-pyrrolidone/sodium styrene sulfonate/methacrylamidopropyltrimethylammonium chloride has been found to be an improved viscosity control additive for water-based drilling muds. The resultant muds display good viscosity characteristics, thermal stability and gel strength when formulated from the terpolymer intramolecular complex having the appropriate polymer concentration and salt level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.