Salt-tolerant, thermally-stable rheology modifiers
US9611416B2 · kind B2 · utility
10Cited by
5References
12Claims
0Family size
Assignee
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Key dates
| Filing date | Oct 25, 2011 |
| Grant date | Apr 4, 2017 |
| Priority date | — |
| Expiry date | Aug 25, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/1818
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A salt-tolerant, thermally-stable rheology modifier and, in particular, a rheology modifier for applications in oilfield well-bore fluids. In accordance with one aspect, the rheology modifier comprises a terpolymer of acrylamide, 2-acrylamido-2-methyl-propanesulfonic acid (AMPS) and a long-chain alkyl acrylate wherein the terpolymer is prepared by dispersion polymerization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.