High temperature high salt low end rheology modifiers
US12241016B2 · kind B2 · utility
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Key dates
| Filing date | Aug 8, 2022 |
| Grant date | Mar 4, 2025 |
| Priority date | — |
| Expiry date | Aug 8, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/145
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A low-end rheology modifier for adjusting rheological characteristics of water-based drilling fluid systems, particularly for high salt, high density drilling fluids in high temperature and high-pressure applications. The low end rheology modifier comprises a copolymer and laponite clay, the copolymer comprising tert-Butylacrylamidosulfonic acid (TBAS) and n-vinylpyrrolidone (NVP) crosslinked with N,N′-Methylenebis(acrylamide).
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