Star-shaped polyacrylamide copolymer and preparation method thereof and drilling fluid including the copolymer
US10774256B2 · kind B2 · utility
0Cited by
0References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2018 |
| Grant date | Sep 15, 2020 |
| Priority date | — |
| Expiry date | Dec 27, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/14
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A star-shaped polyacrylamide copolymer and a preparation method thereof are provided, as well as a drilling fluid containing the star-shaped polyacrylamide copolymer. Only the star-shaped polyacrylamide copolymer is added into the drilling fluid; under a high-temperature environment, the filtration volume of the drilling fluid can be reduced, the high-temperature rheological property of the drilling fluid is improved, and the pressure loss of a circulation system of the drilling fluid is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.