Intramolecular polymer complexes - viscosifiers for high ionic strength drilling fluids
US4540496A · kind A · utility
12Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 25, 1983 |
| Grant date | Sep 10, 1985 |
| Priority date | — |
| Expiry date | Mar 25, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A new family of terpolymers based on acrylamide/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.